U.S. patent number RE46,233 [Application Number 14/135,739] was granted by the patent office on 2016-12-06 for method and apparatus for scheduling transmissions via an enhanced dedicated channel.
This patent grant is currently assigned to InterDigital Technology Corporation. The grantee listed for this patent is InterDigital Technology Corporation. Invention is credited to Robert A. DiFazio, Kyle Jung-Lin Pan, Stephen E. Terry, Peter S. Wang, Guodong Zhang.
United States Patent |
RE46,233 |
Zhang , et al. |
December 6, 2016 |
Method and apparatus for scheduling transmissions via an enhanced
dedicated channel
Abstract
A method and apparatus for scheduling transmissions via an
enhanced dedicated channel (E-DCH) are disclosed. A scheduled power
is calculated for scheduled data flows. A remaining transmit power
is calculated for the E-DCH transmission. A rate request message is
generated, wherein the scheduled power, remaining transmit power
and rate request message are used to select transport format
combinations (TFCs) and multiplex data scheduled for the E-DCH
transmission. The remaining transmit power is calculated by
subtracting from a maximum allowed power the power of a dedicated
physical data channel (DPDCH), a dedicated physical control channel
(DPCCH), a high speed dedicated physical control channel
(HS-DPCCH), an enhanced uplink dedicated physical control channel
(E-DPCCH) and a power margin.
Inventors: |
Zhang; Guodong (Syosset,
NY), Pan; Kyle Jung-Lin (Saint James, NY), Wang; Peter
S. (E. Setauket, NY), DiFazio; Robert A. (Greenlawn,
NY), Terry; Stephen E. (Northport, NY) |
Applicant: |
Name |
City |
State |
Country |
Type |
InterDigital Technology Corporation |
Wilmington |
DE |
US |
|
|
Assignee: |
InterDigital Technology
Corporation (Wilmington, DE)
|
Family
ID: |
37115491 |
Appl.
No.: |
14/135,739 |
Filed: |
December 20, 2013 |
Related U.S. Patent Documents
|
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
11402718 |
Aug 5, 2008 |
7408895 |
|
|
|
60673076 |
Apr 20, 2005 |
|
|
|
Reissue of: |
12173363 |
Jul 15, 2008 |
8081595 |
Dec 20, 2011 |
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W
52/346 (20130101); H04W 52/346 (20130101) |
Current International
Class: |
H04W
52/34 (20090101) |
Field of
Search: |
;370/318,338 |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
Interdigital, "Text Proposal on Enhanced Uplink MAC Architecture
for TS 25.309," 3GPP TSG RAN WG2, #43, R2-041439, Prague, Czech
Republic (Aug. 16-20, 2004). cited by applicant .
NEC, "Remaining power vs. HS-DPCCH power," TSG-RAN Working Group2
#45bis, R2-050221, Sophia Antipolis, France (Jan. 10-14, 2005).
cited by applicant .
Panasonic, "E-TFC Selection," 3GPP TSG-RAN WG2#45bis meeting,
R2-050065, Sophia Antipolis, France (Jan. 10-14, 2005). cited by
applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Requirements for support of radio
resource management (FDD) (Release 1999)," 3GPP TS 25.133 V3.22.0
(Sep. 2005). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Requirements for support of radio
resource management (FDD) (Release 4)," 3GPP TS 25.133 V4.17.0
(Mar. 2006). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; FDD Enhanced Uplink; Overall
description; Stage 2 (Release 6)," 3GPP TS 25.309 V6.6.0 (Mar.
2006). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Requirements for support of radio
resource management (FDD) (Release 1999)," 3GPP TS 25.133 V3.20.0
(Mar. 2005). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Requirements for support of radio
resource management (FDD) (Release 4)," 3GPP TS 25.133 V4.14.0
(Mar. 2005). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Requirements for support of radio
resource management (FDD) (Release 5)," 3GPP TS 25.133 V5.14.0
(Mar. 2005). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Requirements for support of radio
resource management (FDD) (Release 5)," 3GPP TS 25.133 V5.17.0
(Dec. 2005). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Requirements for support of radio
resource management (FDD) (Release 6)," 3GPP TS 25.133 V6.9.0 (Mar.
2005). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Requirements for support of radio
resource management (FDD) (Release 6)," 3GPP TS 25.133 V6.13.0
(Mar. 2006). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Requirements for support of radio
resource management (FDD) (Release 6)," 3GPP TS 25.133 V7.3.0 (Mar.
2006). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; FDD Enhanced Uplink; Overall
description; Stage 2 (Release 6)," 3GPP TS 25.309 V6.2.0 (Mar.
2005). cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Medium Access Control (MAC) protocol
specification (Release 1999)," 3GPP TS 25.321 V3.17.0 (Jun. 2004).
cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Medium Access Control (MAC) protocol
specification (Release 4)," 3GPP TS 25.321 V4.10.0 (Jun. 2004).
cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Medium Access Control (MAC) protocol
specification (Release 5)," 3GPP TS 25.321 V5.10.0 (Dec. 2004).
cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Medium Access Control (MAC) protocol
specification (Release 5)," 3GPP TS 25.321 V5.12.0 (Sep. 2005).
cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Medium Access Control (MAC) protocol
specification (Release 6)," 3GPP TS 25.321 V6.4.0 (Mar. 2005).
cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Medium Access Control (MAC) protocol
specification (Release 6)," 3GPP TS 25.321 V6.8.0 (Mar. 2006).
cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Feasibility Study for Enhanced Uplink
for UTRA FDD (Release 6)," 3GPP TR 25.896 V6.0.0. (Mar. 2004).
cited by applicant .
Third Generation Partnership Project, "Technical Specification
Group Radio Access Network; Feasibility Study for Enhanced Uplink
for UTRA FDD; (Release 6)," 3GPP TR 25.896 V1.0.0 (Sep. 2003).
cited by applicant.
|
Primary Examiner: Steelman; Mary
Attorney, Agent or Firm: Volpe and Koenig, P.C.
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. patent application Ser.
No. 11/402,718 filed Apr. 12, 2006 which issued as U.S. Pat. No.
7,408,895 on Aug. 5, 2008, which claims the benefit of U.S.
Provisional Application No. 60/673,076 filed Apr. 20, 2005, which
is incorporated by reference as if fully set forth.
Claims
What is claimed is:
1. A method of scheduling uplink data transmissions via an enhanced
dedicated channel (E-DCH), the method comprising: calculating a
scheduled power for scheduled data flows by a scheduling grant
processing unit; and calculating a remaining transmit power for the
E-DCH transmission by a remaining transmit power computing unit,
wherein the remaining transmit power is calculated by subtracting
from a maximum allowed power the power of a dedicated physical data
channel (DPDCH), a dedicated physical control channel (DPCCH), a
high speed dedicated physical control channel (HS-DPCCH), an
enhanced uplink dedicated physical control channel (E-DPCCH) and a
power margin.
2. The method of claim 1 further comprising: providing an
integrated circuit incorporating the scheduling grant processing
unit, the remaining transmit power computing unit and a rate
request processing unit; and generating a rate request message by
the rate request processing unit, wherein the scheduled power,
remaining transmit power and rate request message are used to
select transport format combinations (TFCs) and multiplex data
scheduled for the E-DCH transmission.
3. The method of claim 2 further comprising: providing logic for
triggering the rate request message; and providing logic for
constructing the rate request message, wherein the rate request
message includes a plurality of rate request bits.
4. The method of claim 2 wherein the rate request message indicates
total buffer occupancy for any scheduled dedicated channel medium
access channel (MAC) data flows and a power headroom available for
E-DCH data transmission.
5. The method of claim 2 wherein the rate request message is
triggered when there is no current scheduling grant, and new data
is received on logical channels mapped to the E-DCH.
6. The method of claim 2 wherein the rate request message is
triggered when new data of a higher priority than last reported is
received on a logical channel mapped to the E-DCH.
7. The method of claim 2 wherein the rate request message is
triggered when there is no scheduling grant and rate requests are
updated and periodically generated.
8. The method of claim 2 wherein an updated rate request message is
generated when a serving radio link set (RLS) acknowledgement (ACK)
is not received for the previously transmitted rate request
message.
9. The method of claim 1 wherein at least one scheduling grant
received from at least one radio link set (RLS) is used to
calculate the scheduled power.
10. The method of claim 9 wherein the at least one scheduling grant
is an absolute grant received from an E-DCH cell with a primary or
secondary identifier.
11. The method of claim 9 wherein the at least one scheduling grant
is a relative grant received from a serving E-DCH radio link
set.
12. The method of claim 9 wherein the at least one scheduling grant
is a relative grant received from a non-serving E-DCH radio link
set.
13. A wireless transmit/receive unit (WTRU) configured to establish
an enhanced dedicated channel (E-DCH) for uplink transmissions and
scheduling data transmissions via the E-DCH, the WTRU comprising: a
scheduling grant processing unit configured to calculate a
scheduled power for scheduled data flows; and a remaining power
computing unit configured to calculate a remaining transmit power
for E-DCH transmission, wherein the remaining transmit power is
calculated by subtracting from a maximum allowed power the power of
a dedicated physical data channel (DPDCH), a dedicated physical
control channel (DPCCH), a high speed dedicated physical control
channel (HS-DPCCH), an enhanced uplink dedicated physical control
channel (E-DPCCH) and a power margin.
14. The WTRU of claim 13 further comprising: a rate request
processing unit configured to generate a rate request message,
wherein the scheduled power, remaining transmit power and rate
request message are used to select transport format combinations
(TFCs) and multiplex data scheduled for the E-DCH transmission
wherein the scheduling grant processing unit, the remaining power
computing unit and the rate request processing unit are
incorporated into an integrated circuit.
15. The WTRU of claim 14 wherein the rate request processing unit
comprises logic for triggering the rate request message and logic
for constructing the rate request message, wherein the rate request
message includes a plurality of rate request bits.
16. The WTRU of claim 14 wherein the rate request message indicates
total buffer occupancy for any scheduled dedicated channel medium
access channel (MAC) data flows and a power headroom available for
E-DCH data transmission.
17. The WTRU of claim 14 wherein the rate request message is
triggered when there is no current scheduling grant, and new data
is received on logical channels mapped to the E-DCH.
18. The WTRU of claim 13 wherein at least one scheduling grant
received from at least one radio link set (RLS) is used to
calculate the scheduled power.
19. The WTRU of claim 18 wherein the at least one scheduling grant
is an absolute grant received from an E-DCH cell with a primary or
secondary identifier.
20. The WTRU of claim 18 wherein the at least one scheduling grant
is a relative grant received from a serving E-DCH radio link
set.
21. The WTRU of claim 18 wherein the at least one scheduling grant
is a relative grant received from a non-serving E-DCH radio link
set.
.Iadd.22. A wireless transmit/receive unit (WTRU) comprising: an
integrated circuit configured to trigger scheduling information;
the integrated circuit configured to determine a serving grant; the
integrated circuit configured to determine a remaining transmit
power; the integrated circuit configured to select a size of a
medium access control-e (MAC-e) protocol data unit (PDU) based on
the serving grant, the triggered scheduling information and the
remaining transmit power; and a transmitter operatively coupled to
the integrated circuit, the transmitter configured to transmit the
MAC-e PDU..Iaddend.
.Iadd.23. The WTRU of claim 22 wherein the remaining transmit power
is derived based on a selected transport format combination for a
dedicated channel..Iaddend.
.Iadd.24. The WTRU of claim 22 wherein the remaining transmit power
is derived based on subtracting a dedicated physical data channel
estimated power, a dedicated physical control channel estimated
power and an enhanced uplink dedicated physical control channel
uplink power from a maximum allowed power..Iaddend.
.Iadd.25. The WTRU of claim 24 wherein the remaining transmit power
is further derived by subtracting a high speed downlink physical
control channel estimated power from the maximum allowed
power..Iaddend.
.Iadd.26. The WTRU of claim 24 wherein the remaining transmit power
is further derived by subtracting a margin from the maximum allowed
power..Iaddend.
.Iadd.27. The WTRU of claim 22 wherein the scheduling information
includes a total buffer occupancy for scheduled MAC-d flows and a
buffer occupancy for a highest priority MAC-d flow..Iaddend.
.Iadd.28. The WTRU of claim 22 wherein the integrated circuit is
further configured to trigger scheduling information based on
periodic triggering configured by radio resource control
procedure..Iaddend.
.Iadd.29. A wireless transmit/receive unit (WTRU) comprising: an
integrated circuit configured to trigger scheduling information
based on a condition that higher priority data is received and a
current scheduling grant is zero; the integrated circuit configured
to determine a serving grant; the integrated circuit configured to
select a size of a medium access control-e (MAC-e) protocol data
unit (PDU) based on the serving grant and the triggered scheduling
information; and a transmitter operatively coupled to the
integrated circuit, the transmitter configured to transmit the
MAC-e PDU..Iaddend.
.Iadd.30. A method comprising: triggering scheduling information,
by a wireless transmit/receive unit (WTRU); determining, by the
WTRU, a serving grant; determining, by the WTRU, a remaining
transmit power; selecting a size of a medium access control-e
(MAC-e) protocol data unit (PDU), by the WTRU, based on the serving
grant, the triggered scheduling information and the remaining
transmit power; and transmitting, by the WTRU, the MAC-e
PDU..Iaddend.
.Iadd.31. The method of claim 30 wherein the remaining transmit
power is derived based on a selected transport format combination
for a dedicated channel..Iaddend.
.Iadd.32. The method of claim 30 wherein the remaining transmit
power is derived based on subtracting a dedicated physical data
channel estimated power, a dedicated physical control channel
estimated power and an enhanced uplink dedicated physical control
channel uplink power from a maximum allowed power..Iaddend.
.Iadd.33. The method of claim 32 wherein the remaining transmit
power is further derived by subtracting a high speed downlink
physical control channel estimated power from the maximum allowed
power..Iaddend.
.Iadd.34. The method of claim 32 wherein the remaining transmit
power is further derived by subtracting a margin from the maximum
allowed power..Iaddend.
.Iadd.35. The method of claim 30 wherein the scheduling information
includes a total buffer occupancy for scheduled MAC-d flows and a
buffer occupancy for a highest priority MAC-d flow..Iaddend.
.Iadd.36. The method of claim 30 wherein the triggering scheduling
information is based on periodic triggering configured by radio
resource control procedure..Iaddend.
.Iadd.37. A method comprising: triggering scheduling information,
by a wireless transmit/receive unit (WTRU) based on a condition
that higher priority data is received and a current scheduling
grant is zero; determining, by the WTRU, a serving grant; selecting
a size of a medium access control-e (MAC-e) protocol data unit
(PDU), by the WTRU, based on the serving grant and the triggered
scheduling information; and transmitting, by the WTRU, the MAC-e
PDU..Iaddend.
.Iadd.38. A Node B comprising: a transmitter operatively coupled to
an integrated circuit, the transmitter and the integrated circuit
configured to transmit absolute grants and relative grants to a
wireless transmit/receive unit (WTRU); and a receiver operatively
coupled to the integrated circuit, the receiver configured to
receive an enhanced uplink transmission from the WTRU including a
medium access control-e (MAC-e) protocol data unit (PDU) having a
size derived from triggered scheduling information and a scheduling
grant; wherein the scheduling grant being derived from at least one
of the transmitted absolute grants and at least one of the
transmitted relative grants; and wherein the scheduling information
was triggered based on a condition that higher priority data is
received and a current scheduling grant is zero..Iaddend.
.Iadd.39. The Node B of claim 38 wherein the triggered scheduling
information includes a total buffer occupancy for scheduled MAC-d
flows and a buffer occupancy for a highest priority MAC-d
flow..Iaddend.
.Iadd.40. A method comprising: transmitting, by a Node B, absolute
grants and relative grants to a wireless transmit/receive unit
(WTRU); and receiving an enhanced uplink transmission, by the Node
B, from the WTRU including a medium access control-e (MAC-e)
protocol data unit (PDU) having a size derived from triggered
scheduling information and a scheduling grant; wherein the
scheduling grant being derived from at least one of the transmitted
absolute grants and at least one of the transmitted relative
grants; and wherein the scheduling information was triggered based
on a condition that higher priority data is received and a current
scheduling grant is zero..Iaddend.
.Iadd.41. The method of claim 40 wherein the triggered scheduling
information includes a total buffer occupancy for scheduled MAC-d
flows and a buffer occupancy for a highest priority MAC-d
flow..Iaddend.
Description
FIELD OF INVENTION
The present invention relates to wireless communication systems.
More particularly, the present invention is related to a method and
apparatus for scheduling transmissions via an enhanced dedicated
channel (E-DCH).
BACKGROUND
Methods for improving uplink (UL) coverage, throughput, and
transmission latency are currently being investigated in the third
generation partnership project (3GPP). In order to achieve these
goals, enhanced uplink (EU) transmissions have been proposed in
3GPP, in which control, (i.e., scheduling and assigning), of UL
resources, (i.e., physical channels), is moved from a radio network
controller (RNC) to a Node-B.
FIG. 1A shows a conventional wireless transmit/receive unit (WTRU),
(e.g., mobile station), side medium access control (MAC)
architecture 100. The WTRU MAC architecture 100 includes a
MAC-es/MAC-e entity 105, which comprises different independent
sub-layer entities within the MAC. The MAC-es/-e functionality
split is a result of how the MAC functionality is partitioned
within the universal terrestrial radio access network (UTRAN). The
WTRU MAC architecture 100 further includes a high speed MAC entity
110, a MAC-c/sh 115, a dedicated channel MAC (MAC-d) 120 and a MAC
control service access point (SAP) 125. The MAC-c/sh 115 controls
access to all common transport channels, except the HS-DSCH
transport channel 145. The MAC-d 120 controls access to all
dedicated transport channels, to the MAC-c/sh 115 and the MAC-hs
110. The MAC-hs 110 controls access to the HS-DSCH transport
channel 145.
The MAC-es/MAC-e entity 105 controls access to an E-DCH 130,
whereby the MAC-d 120 may access the E-DCH 130 via a connection
135, and the MAC control SAP 125 may access the E-DCH 130 via a
connection 140.
FIG. 1B shows MAC interworking in the conventional WTRU of FIG. 1A.
As shown in FIG. 1B, a radio link control (RLC) protocol data unit
(PDU) enters the MAC-d on a logical channel. In the MAC-e header, a
data description indicator (DDI) field, (6 bits), identifies the
logical channel, MAC-d flow and MAC-d PDU size. A mapping table is
signaled over radio resource control (RRC) signaling to allow the
WTRU to set the DDI values. The N field, (fixed size of 6 bits),
indicates the number of consecutive MAC-d PDUs corresponding to the
same DDI value. A special value of the DDI field indicates that no
more data is contained in the remaining part of the MAC-e PDU. The
transmission sequence number (TSN) field (6 bits) provides the
transmission sequence number on the E-DCH 130 shown in FIG. 1A. The
MAC-e PDU is forwarded to a hybrid-automatic repeat request (H-ARQ)
entity, which then forwards the MAC-e PDU to layer 1 for
transmission in one transmission time interval (TTI).
An efficient MAC architecture for scheduling the transmission of
E-DCH data is desired.
SUMMARY
The present invention is related to a method and apparatus for
scheduling transmissions via an E-DCH. A scheduled power is
calculated for scheduled data flows. A remaining transmit power is
calculated for the E-DCH transmission. A rate request message is
generated, wherein the scheduled power, remaining transmit power
and rate request message are used to select transport format
combinations (TFCs) and multiplex data scheduled for the E-DCH
transmission. The remaining transmit power is calculated by
subtracting from a maximum allowed power the power of a dedicated
physical data channel (DPDCH), a dedicated physical control channel
(DPCCH), a high speed dedicated physical control channel
(HS-DPCCH), an enhanced uplink dedicated physical control channel
(E-DPCCH) and a power margin.
BRIEF DESCRIPTION OF THE DRAWINGS
A more detailed understanding of the invention may be had from the
following description of a preferred example, given by way of
example and to be understood in conjunction with the accompanying
drawings wherein:
FIG. 1A shows a conventional WTRU side MAC architecture;
FIG. 1B prior art MAC inter-working in the conventional WTRU of
FIG. 1A;
FIG. 2 shows a WTRU MAC-e architecture configured in accordance
with the present invention;
FIG. 3 is a flow diagram of a MAC-e scheduling process in
accordance with the present invention; and
FIG. 4 shows an example of a pre-processed MAC-e PDU format in
accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Hereafter, the terminology "WTRU" includes but is not limited to a
user equipment (UE), a mobile station, a fixed or mobile subscriber
unit, a pager, or any other type of device capable of operating in
a wireless environment. When referred to hereafter, the terminology
"Node-B" includes but is not limited to a base station, a site
controller, an access point or any other type of interfacing device
in a wireless environment.
Hereinafter, the terminology "MAC-e" will be used to reference both
MAC-e and MAC-es collectively.
The features of the present invention may be incorporated into an
integrated circuit (IC) or be configured in a circuit comprising a
multitude of interconnecting components.
FIG. 2 shows a WTRU MAC-e architecture 200 configured in accordance
with the present invention. The WTRU MAC-e architecture 200
includes a scheduling grant processing unit 210, a remaining
transmit power computing unit 215 and a rate request processing
unit 220.
The scheduling grant processing unit 210 receives at least one
scheduling grant from at least one radio link set (RLS) and derives
a current scheduling grant. The scheduling grant may be an absolute
grant 225 received from a serving E-DCH cell with a primary or
secondary identifier, (i.e., an E-DCH radio network temporary
identifier (E-RNTI) is used to determine if the absolute grant is
primary or secondary), a relative grant 230 received from a serving
E-DCH RLS or a relative grant 235 received from a non-serving E-DCH
RLS. The scheduling grant processing unit 210 outputs a signal 240
indicating the amount of scheduled power for use by an E-TFC
selection and multiplexing function for scheduled data MAC-d
flows.
The amount of scheduled power may be identified as a ratio to the
DPCCH power. For example, if the DPCCH power is P, the amount of
scheduled power has a ratio of 2 to the DPCCH power. Thus, the
amount of scheduled power is 2 P. Alternatively, the amount of
scheduled power can be identified as the maximum transmit power
that can be used for scheduled data to avoid the E-TFC selection
and multiplexing function to be aware of DPCCH power measurements.
Since DPCCH power changes rapidly, there is processing overhead if
it has to be propagated to different entities within the MAC.
Furthermore, it is complex to synchronize the timing. Therefore,
having only one entity in the MAC-e aware of the DPCCH power is
preferred since other scheduling related functions require
knowledge of current DPCCH power.
When the MAC-e entity 105 invokes the MAC-e function, the
scheduling grant processing unit 210 determines the current serving
grant. The physical layer provides absolute grants 225 received
from the AGCH, indicating whether the grant was received with a
primary or secondary E-RNTI. The physical layer also provides
relative grants 230, 235 received from each RLS, indicating if the
RLS is either a serving E-DCH RLS or a non-serving E-DCH RLS.
Absolute grants 225 are signaled as the ratio to the current UL
DPCCH power. Absolute grants 225 received with a primary E-RNTI
always reset the current serving grant. Absolute grants received
with a secondary E-RNTI only affect the current serving grant if
previously set by a secondary E-RNTI or the grant is set to
zero.
Relative grants 230 from the serving E-DCH RLS adjust the serving
grant in steps up, or down. Relative grants for the non-serving
E-DCH RLS can only lower the serving grant by one step. When a
relative grant down from a non-serving E-DCH RLS is received, a
hysteresis period is started during which other relative grant
downs are ignored.
The remaining transmit power computing unit 215 receives a signal
245 indicating current DPCCH power estimated by the physical layer,
a signal 250 indicating an DCH TFC selected by the MAC-d or DPDCH
power estimated by the physical layer, a signal 255 for indicating
HS-DPCCH active from the physical layer and a signal 260 indicating
maximum allowed power (with a power margin) from a lower layer
management entity (LLME) configured by the radio resource
controller (RRC). If the HS-DPCCH is active, its power (and power
from other channels) must be subtracted from the maximum power to
determine the remaining power. Based on signals 245, 250, 255 and
260, the remaining transmit power computing unit 215 outputs a
signal 265 indicating a remaining transmit power (P.sub.remain)
which is computed in accordance with the following equation (1):
P.sub.remain=P.sub.allowed-P.sub.DPDCH-P.sub.DPCCH-P.sub.HS-DPCCH-P.sub.E-
-DPCCH-Margin; Equation (1) where P.sub.DPCCH, P.sub.DPDCH,
P.sub.HS-DPCCH and D.sub.E-DPCCH represent power requirements of
the DPCCH, the DPDCH, the HS-DPCCH and the E-DPCCH, respectively.
The rate request processing unit 220 monitors triggering events for
rate requests, and triggers a scheduling information rate request
when a triggering event occurs. The rate request processing unit
220 provides logic for triggering the rate request and logic for
constructing a rate request message 270 including rate request
bits.
The rate request may be triggered when new data on logical channels
mapped to the E-DCH is received when there is no current scheduling
grant, new data of a higher priority then last reported is received
on a logical channel mapped to the E-DCH, when there is no
scheduling grant and rate requests are updated and periodically
generated, (which is configured by RRC procedures), and when a
serving RLS acknowledgement (ACK) is not received for the
previously transmitted rate request, an updated rate request is
generated.
The rate request includes the total buffer occupancy for all
scheduled MAC-d flows, the highest priority data buffer occupancy
for any scheduled MAC-d flow, and a power head-room available for
E-DCH transmission.
Referring to FIG. 3, a MAC-e scheduling process 300 is explained
hereinafter. For each E-DCH TTI, the E-DCH is monitored and it is
determined whether a scheduling information rate request trigger
occurs and/or whether there is E-DCH data with a grant available
(step 302). If no rate request trigger occurs or there is no E-DCH
data available, the process waits until the next TTI. If the
determination at step 302 is positive, it is further determined
whether there is an H-ARQ process available (step 304).
Availability of an H-ARQ process is required before E-TFC selection
and E-DCH data transmission. If there is no available H-ARQ
process, the process 300 waits until the next TTI. If an H-ARQ
process is determined to be available at step 304, a current
scheduling grant and remaining transmit power calculation are
requested from the scheduling grant processing unit 210 and the
remaining transmit power computing unit 215, respectively (step
306). In step 308, a MAC-e control function invokes scheduling and
E-TFC selection functions to generate a MAC-e PDU. In step 310, the
MAC-e PDU is then forwarded to the available H-ARQprocess with a
unique power offset and maximum number of retransmissions.
In a separate embodiment to meet the timing requirement of the
MAC-e PDU formation, pre-calculation of the possible MAC-e PDUs for
speeding up the formation process is employed. When the MAC-e
entity is requested with the remaining power budget for the E-DCH
transmission, the formation process searches the pre-formatted
MAC-e PDU table, (mainly its formatted MAC-e PDU header and
appropriated data block PDUs), providing ready information to the
H-ARQ/physical layer. There are a number of ways for performing the
preprocessing, depending on the timing requirement.
FIG. 4 shows an example of a preprocessed MAC-e PDU format in
accordance with the present invention. The preprocessed MAC-e PDU
format consists of a power budget for E-DCH or equivalent, a fully
formatted MAC-e PDU header optimally fitting the budget or
equivalent, a list of transmission sequence numbers (TSNs) and data
block pointers, scheduling information and padding bits.
The power budget for E-DCH includes a number of predicted power or
equivalent situations based on the last transmission power and the
prediction of the current possible power budget. The MAC-e PDU
header is formatted based on this budget and the data priority on
the same row. The fully formatted MAC-e PDU header describes the
MAC-e PDU, with the logical channel priority considered, and the
scheduled and non-scheduled data and budget considered. The header
includes the DDI, N and the DDI-terminator. A list of the MAC-es
PDUs descriptors, including the TSN and data pointers to the MAC-es
data blocks, correspond to the same row pre-formatted PDU header.
Scheduling information may go with the MAC-e PDU if it exists.
Padding bits indicate the number of bits to be padded at the end of
the MAC-e PDU for that particular row. The full formation can use
the following partial formation: power budget for E-DCH or
Equivalent, DDI, scheduled or non-scheduled. This sorted list is
based on the data priority. Each row is a MAC-d-flow. (MAC-es
PDUs). The power budget is a list of predicted power budget. The
DDI represents the MAC-d-flow-ID, logical channel ID and the PDU
size. The scheduled or non-scheduled column indicates that the PDUs
consume the non-scheduled power budget or scheduled power budget.
Non-scheduled data can also be used with scheduled information in
the Mac-e PDU.
Although the features and elements of the present invention are
described in the preferred embodiments in particular combinations,
each feature or element can be used alone without the other
features and elements of the preferred embodiments or in various
combinations with or without other features and elements of the
present invention.
* * * * *