U.S. patent application number 14/922359 was filed with the patent office on 2016-02-11 for method and apparatus for configuring radio access bearers for enhanced uplink services.
This patent application is currently assigned to INTERDIGITAL TECHNOLOGY CORPORATION. The applicant listed for this patent is InterDigital Technology Corporation. Invention is credited to Stephen G. Dick, James M. Miller, Stephen E. Terry, Guodong Zhang.
Application Number | 20160044658 14/922359 |
Document ID | / |
Family ID | 34983353 |
Filed Date | 2016-02-11 |
United States Patent
Application |
20160044658 |
Kind Code |
A1 |
Terry; Stephen E. ; et
al. |
February 11, 2016 |
METHOD AND APPARATUS FOR CONFIGURING RADIO ACCESS BEARERS FOR
ENHANCED UPLINK SERVICES
Abstract
A method for controlling enhanced uplink transmission,
implemented by a Node-B is disclosed. A Node-B receives
configuration information from a radio network controller (RNC).
The configuration information includes a maximum number of
retransmissions associated with each of a plurality of medium
access control for dedicated channel (MAC-d) flows for an enhanced
uplink channel The Node-B transmits performance information to the
RNC. The performance information indicates that the maximum number
of retransmissions associated with one of the plurality of MAC-d
flows is exceeded.
Inventors: |
Terry; Stephen E.;
(Northport, NY) ; Zhang; Guodong; (Syosset,
NY) ; Miller; James M.; (Verona, NJ) ; Dick;
Stephen G.; (Nesconset, NY) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
InterDigital Technology Corporation |
Wilmington |
DE |
US |
|
|
Assignee: |
INTERDIGITAL TECHNOLOGY
CORPORATION
Wilmington
DE
|
Family ID: |
34983353 |
Appl. No.: |
14/922359 |
Filed: |
October 26, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
13725504 |
Dec 21, 2012 |
9173204 |
|
|
14922359 |
|
|
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|
11115999 |
Apr 27, 2005 |
8345644 |
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|
13725504 |
|
|
|
|
60566458 |
Apr 29, 2004 |
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Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04W 52/48 20130101;
H04W 28/18 20130101; H04W 88/12 20130101; H04W 72/0406 20130101;
H04W 72/085 20130101; H04W 52/20 20130101; H04W 72/0413 20130101;
H04W 84/042 20130101; H04W 52/50 20130101 |
International
Class: |
H04W 72/04 20060101
H04W072/04 |
Claims
1. A method for controlling enhanced uplink (EU) transmission,
implemented by a Node B, comprising: receiving, by a Node B,
configuration information from a radio network controller (RNC),
the configuration information including a maximum number of
retransmissions associated with each of a plurality of medium
access control for dedicated channel (MAC-d) flows for an EU
channel; and transmitting performance information to the RNC, the
performance information indicating that the maximum number of
retransmissions associated with one of the plurality of MAC-d flows
is exceeded.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 13/725,504 filed on Dec. 21, 2012, which is a
continuation of U.S. patent application Ser. No. 11/115,999 filed
on Apr. 27, 2005, which issued as U.S. Pat. No. 8,345,644 on Jan.
1, 2013, which claims the benefit of U.S. Provisional Application
No. 60/566,458 filed on Apr. 29, 2004, which is incorporated by
reference herein as if fully set forth.
FIELD OF INVENTION
[0002] The present invention is related to a wireless communication
system including at least one wireless transmit/receive unit
(WTRU), a least one Node-B and a radio network controller (RNC).
More particularly, the present invention is a method and system for
configuring enhanced uplink (EU) radio access bearers (RABs) for
supporting EU services in the wireless communication system.
BACKGROUND
[0003] Methods for improving uplink (UL) coverage, throughput and
transmission latency are currently being investigated in the 3rd
generation partnership project (3GPP). In order to achieve these
goals, control, (i.e., scheduling and assigning), of UL resources,
(i.e., physical channels), will be moved from the RNC to the
Node-B.
[0004] The Node-B can make decisions and manage uplink radio
resources on a short-term basis more efficiently than the RNC.
However, the RNC should retain coarse overall control of the EU RAB
in terms of an allowed transport format combination set (TFCS),
maximum allowed transmit power, or the like.
SUMMARY
[0005] The present invention is related to a wireless communication
method and system for controlling an EU RAB. The wireless
communication system includes at least one WTRU, at least one
Node-B and an RNC. The RNC configures an EU RAB to operate on an
enhanced dedicated channel (E-DCH). At least one of the WTRU and
the Node-B report EU traffic statistics and EU performance
statistics to the RNC. The RNC then adjusts the configuration of
the EU RAB in accordance with the received EU traffic statistics
and the EU performance statistics.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] A more detailed understanding of the invention may be had
from the following description of a preferred embodiment, given by
way of example and to be understood in conjunction with the
accompanying drawing wherein:
[0007] FIG. 1 is a block diagram of a wireless communication system
configured in accordance with the present invention; and
[0008] FIG. 2 is a signal diagram of a process implemented in the
system of FIG. 1 for configuring an EU RAB.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0009] 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.
[0010] 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.
[0011] FIG. 1 is a block diagram of a wireless communication system
100 configured in accordance with the present invention. The system
100 includes at least one WTRU 102, at least one Node-B 104 and an
RNC 106. An E-DCH 108, (along with associated signaling channels),
is established between the WTRU 102 and the Node-B 104, in addition
to a regular dedicated channel (DCH) 110. Of course, those of skill
in the art would understand that FIG. 1 does not depict all of the
signaling, such as any downlink (DL) channels, between the WTRU 102
and the Node-B 104 that is not specifically relevant to the present
invention.
[0012] The RNC 106 retains overall control of EU RAB via an Iub/Iur
interface 112. By properly setting the EU RAB parameters, the RNC
106 can keep coarse control of the EU RAB and radio resources will
be efficiently utilized for both regular DCHs 110 and E-DCHs 108.
The RNC 106 controls the EU RAB without closely monitoring EU
transmissions from the WTRU 102 to the Node-B 104 sent over an
E-DCH 108 on a transmission time interval (TTI) basis.
[0013] When the RAB is configured to transfer E-DCH data, the RNC
106 establishes configuration of EU services for the RAB by
establishing WTRU configuration requirements. The initial
configuration for each WTRU 102 supporting the EU services may
include, but is not limited to, at least one of an allowed
transport format combination set (TFCS) for E-DCH, allowed
modulation and coding schemes (MCSs) for E-DCH, a maximum allowed
E-DCH transmit power and a maximum allowed WTRU transmit power. The
maximum allowed WTRU transmit power limits the sum of transmit
power on a regular DCH, an E-DCH, an uplink signaling channel for
high speed downlink packet access (HSDPA) and an uplink signaling
channel for E-DCH.
[0014] The RAB may be configured using at least one of a channel
allocation request response timer, (which defines a time limit for
a Node-B to provide an E-DCH allocation information before the WTRU
generates another periodic channel allocation request), a block
error rate (BLER) of an E-DCH transport channel (TrCH), a
signal-to-interference ratio (SIR) of the E-DCH TrCH, mapping of
medium access control for DCH (MAC-d) flows to an E-DCH TrCH, a
maximum number of automatic repeat request (ARQ) retransmissions
(preferably per MAC-d flow), a maximum number of hybrid-ARQ (H-ARQ)
retransmissions, and a data lifespan timer, (defining a time limit
for expiration of transmission of the E-DCH data), within a WTRU
MAC for EU (MAC-e) and a physical layer for EU (PHY-e) for each
TrCH. The WTRU MAC-e may discard the E-DCH data when the maximum
number of H-ARQ retransmissions is exceeded or when the lifespan
timer expires.
[0015] Initially, the allowed TFCS and MCSs for E-DCH are
configured by considering at least one of the current load of
regular DCH traffic in the UL of a cell, current load of EU traffic
in a cell, and information of the WTRU 102 to be configured for EU
services. The current load of regular DCH traffic in the uplink of
a cell is determined by at least one of resource usage, average
transmit power, average interference, a required energy per bit to
noise ratio, a data rate, and an activity factor. The current load
of EU traffic in a cell is determined by at least one of resource
usage, average transmit power, average interference, possible MCS,
average probability that each MCS is applied, a required energy per
bit to noise ratio of each MCS, possible TFCs and average
probability that each TFC may be applied, and an activity factor.
Information of the WTRU 102 to be configured for EU services
includes information of its current regular DCH, (a data rate, a
required energy per bit to noise ratio and an activity factor on
regular DCH), and information of expected E-DCH, (expected data
rate of the EU services, QoS (such as block error rate), activity
factor, or the like.
[0016] The maximum allowed transmit power of the WTRU 102 should be
configured because EU service is added to the RAB that currently
has regular DCHs. The maximum allowed E-DCH transmit power and
maximum allowed WTRU transmit power are determined by considering
the same factors for the allowed TFCS and MCS with some additional
factors, such as current maximum allowed WTRU transmit power
configured by the RNC 106, and the number of events that maximum
transmit power is reached.
[0017] Parameters such as maximum number of H-ARQ/ARQ
retransmissions, a lifespan timer, or the like, are determined
based on the QoS of RABs mapped to the MAC-d flow. The maximum
H-ARQ retransmissions and WTRU MAC-e transmission lifespan are
determined by considering maximum allowed transmission latency and
BLER requirements to maintain QoS. MAC-d flows occur between
logical channels and transport channels of the WTRU 102, which are
used to establish the parameters of the EU RAB.
[0018] Each MAC-d flow has unique configurable parameters that
relate to a required QoS for the RABs. The WTRU 102 and the Node-B
104 may be configured by the RNC 106 to multiplex a plurality of
MAC-d flows on an E-DCH TrCH. Scheduling priority may be given to
one MAC-d flow over another MAC-d flow. This may be accomplished by
an absolute priority mechanism where transmission of higher
priority data is always maximized. At least one of allowed
transport formats (TFs), MCSs, transmit power, BLER, MAC for DCH
(MAC-d) flow mapping, maximum number of H-ARQ/ARQ retransmissions
and data lifespan parameters may be unique for each MAC-d flow.
[0019] Scheduled EU transmissions can only use TFCS and MCSs that
are allowed in the configuration. The transmit power on E-DCH
should not exceed the maximum allowed E-DCH transmit power
configured by the RNC 106. The sum of transmit power on a regular
DCH and an E-DCH should not exceed the maximum allowed WTRU
transmit power configured.
[0020] The transmissions of the WTRU 102 on the E-DCH 108 are also
subject to the constraint of the parameters configured for the
E-DCH TrCH, (e.g., a lifespan timer, a maximum number of H-ARQ
retransmissions, a number of ARQ retransmissions, or the like). If
the maximum number of H-ARQ process transmissions or the
transmission lifespan timer is exceeded, the WTRU MAC-e may discard
the transmission and initiate service of the next transmission from
higher layers.
[0021] Once the WTRU 102 starts to operate on the E-DCH 108, EU
traffic statistics and performance statistics are reported to the
RNC 106 for each MAC-d flow or TrCH mapped to the EU RAB. The EU
traffic statistics include traffic volume measurement (TVM) of EU
data stored in the WTRU 102, and volume of successful or
unsuccessful EU data transmissions which occur over a predetermined
time period. The EU performance statistics include at least one of
resource utilization per cell, resource utilization per WTRU, an
ACK/NACK ratio per cell, an ACK/NACK ratio per resource, an
ACK/NACK ratio per WTRU, average number of transmissions that
failed in the medium access control (MAC) layer, (or average number
of transmissions that failed in the MAC layer), average channel
quality indicator (CQI) results per cell, average CQI results per
resource, average CQI per WTRU, best CQI results, worst CQI
results, the number of events for which WTRU maximum transmit power
is reached, the number events for which EU maximum transmit power
of the WTRU is reached, the number of transmission failures due to
hybrid-automatic repeat request (H-ARQ) process retransmission
limit, and the number of transmission failures due to EU
transmission lifespan timeout,
[0022] EU traffic and performance statistics may be reported from
the WTRU 102 and the Node-B 104 to the RNC 106. The report from the
WTRU 102 may be relayed by the Node-B 104 to the RNC 106. The
reporting can be periodic or threshold based. The periods or
thresholds of reporting are set by the RNC 106 and are also design
parameters.
[0023] In the case that EU traffic and performance statistics are
reported only by the Node-B 104 to the RNC 106, the EU traffic and
performance statistics that are collected by the WTRU 102 are
reported to the Node-B 104 through a physical or MAC layer
signaling. If EU traffic and performance statistics are forwarded
to the Node-B 104 from the WTRU 102 using physical or MAC layer
signaling, they can be collected and forwarded to the RNC 106 via
the Iub/Iur interface 112.
[0024] Other measurement data known only to the Node-B 104 can also
be sent to the RNC 106 to allow for the RNC 106 to control EU
resources. This includes received code power on EU assigned codes
reported on a WTRU or cell basis, interference received based on EU
assigned codes, and an ACK/NACK ratio as perceived by the Node-B
104.
[0025] In addition to EU traffic and performance statistics and
measurement reports sent to the RNC 106, the adjustment of
configuration of EU services also depends on some information that
are collected by the RNC 106 itself, which includes traffic and
performance statistics of a regular DCH 110 and some EU performance
statistics.
[0026] Upon receiving the reported EU traffic and performance
statistics and measurement reports from the WTRU 102 and/or the
Node-B 104, the RNC 106 adjusts configuration of the EU RAB, such
as allowed TFs, MCSs, transmit power, BLER, MAC-d flow mapping,
H-ARQ retransmission and data lifespan parameters for each MAC-d
flow or TrCH according to the reported traffic and performance
statistics. In this way, the RNC 106 keeps coarse control of the EU
RAB.
[0027] FIG. 2 is a signal diagram of a process 200 implemented in
the system 100 for configuring and reconfiguring EU RABs in
accordance with the present invention. The method is implemented
between at least one WTRU 102, at least one Node-B 104 and an RNC
106. The RNC 106 sends initial configuration parameters, (e.g.,
channelization codes, maximum interference, maximum allowed
TFCS/MCSs, a maximum allowed E-DCH and WTRU power, or the like),
for the Node-B 104 through the Iub/Iur interface 112 (step 202).
The RNC 106 configures an EU RAB by system configuration
parameters, (e.g., maximum allowed TFCS/MCSs, maximum allowed E-DCH
and WTRU power, the maximum number of H-ARQ transmissions, a data
lifespan timer, a channel allocation response timer for periodic
channel allocation request generation, or the like), to the WTRU
102 through radio resource control (RRC) messages when the EU RAB
is configured to operate on the E-DCH 108 (step 204). EU scheduling
is performed by the Node-B 104 within the limits of the
configuration set by the RNC 106 and transmitted by physical or MAC
layer signaling (step 206). The WTRU 102 reports EU traffic and
performance statistics, (e.g., TVM, amount of transmit (TX) data,
an ACK/NACK ratio, a channel quality indicator (CQI), and the
number of maximum power events, or the like), to the RNC 106
through RRC messages (step 208), or to the Node-B 104 by physical
or MAC layer signaling (step 210) to be forwarded to the RNC 106
via the Iubdur interface 112 (step 212). The RNC 106 reconfigures
the EU services and the EU RAB in accordance with the reported
statistics (step 202).
[0028] 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.
* * * * *