U.S. patent application number 14/101826 was filed with the patent office on 2014-04-10 for method and apparatus for indictating a temporary block flow to which a piggybacked acknowledgement/non-acknowledgement field is addressed.
This patent application is currently assigned to InterDigital Technology Corporation. The applicant listed for this patent is InterDigital Technology Corporation. Invention is credited to Behrouz Aghili, Prabhakar R. Chitrapu, Stephen G. Dick, Yan Li, Philip J. Pietraski, Marian Rudolf.
Application Number | 20140098769 14/101826 |
Document ID | / |
Family ID | 39720360 |
Filed Date | 2014-04-10 |
United States Patent
Application |
20140098769 |
Kind Code |
A1 |
Rudolf; Marian ; et
al. |
April 10, 2014 |
METHOD AND APPARATUS FOR INDICTATING A TEMPORARY BLOCK FLOW TO
WHICH A PIGGYBACKED ACKNOWLEDGEMENT/NON-ACKNOWLEDGEMENT FIELD IS
ADDRESSED
Abstract
Methods and base stations are described. A base station includes
a receiver, a processor and a transmitter. The receiver receives a
first data block associated with an uplink temporary block flow
(TBF), and the first data block includes a first header that
includes a temporary flow identity (TFI) that identifies the uplink
TBF. The processor generate a piggybacked
acknowledgement/non-acknowledgement (PAN) field corresponding to
the uplink TBF and a PAN check sequence (PCS) based on the PAN
field, masks a subset of PCS bits with the TFI to generate a masked
PCS, and generates a second data block, associated with a downlink
TBF, that includes a second header, a data part corresponding to
the downlink TBF, the PAN field, and the masked PCS. The
transmitter transmits the second data block.
Inventors: |
Rudolf; Marian; (Montreal,
CA) ; Aghili; Behrouz; (Commack, NY) ;
Chitrapu; Prabhakar R.; (Blue Bell, PA) ; Dick;
Stephen G.; (Nesconset, NY) ; Pietraski; Philip
J.; (Jericho, NY) ; Li; Yan; (Morganville,
NJ) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
InterDigital Technology Corporation |
Wilmington |
DE |
US |
|
|
Assignee: |
InterDigital Technology
Corporation
Wilmington
DE
|
Family ID: |
39720360 |
Appl. No.: |
14/101826 |
Filed: |
December 10, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
13406121 |
Feb 27, 2012 |
|
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|
14101826 |
|
|
|
|
12056433 |
Mar 27, 2008 |
8126013 |
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13406121 |
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|
60956765 |
Aug 20, 2007 |
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60945057 |
Jun 19, 2007 |
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60944982 |
Jun 19, 2007 |
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60945034 |
Jun 19, 2007 |
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60908535 |
Mar 28, 2007 |
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Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04L 1/0068 20130101;
H04L 1/0041 20130101; H04L 2001/125 20130101; H04L 1/0057 20130101;
H04W 28/06 20130101; H04L 1/1664 20130101; H04L 1/0073
20130101 |
Class at
Publication: |
370/329 |
International
Class: |
H04W 28/06 20060101
H04W028/06 |
Claims
1. A method for use in a Global System for Mobile Communication
(GSM)/Enhanced Data Rates for Global Evolution (EDGE) Radio Access
Network (GERAN) compliant base station, the method comprising:
receiving a first data block associated with an uplink temporary
block flow (TBF), wherein the first data block includes a first
header that includes a temporary flow identity (TFI) that
identifies the uplink TBF; generating a piggybacked
acknowledgement/non-acknowledgement (PAN) field corresponding to
the uplink TBF; generating a PAN check sequence (PCS) based on the
PAN field; masking a subset of PCS bits with the TFI to generate a
masked PCS; generating a second data block, associated with a
downlink TBF, that includes a second header, a data part
corresponding to the downlink TBF, the PAN field, and the masked
PCS; and transmitting the second data block.
2. The method of claim 1, wherein the subset of PCS bits is a first
N bits of the PCS bits, or a last N bits of the PCS bits.
3. The method of claim 1, wherein the PCS is generated by
performing cyclic redundancy check (CRC) encoding with the PAN
field.
4. A Global System for Mobile Communication (GSM)/Enhanced Data
Rates for Global Evolution (EDGE) Radio Access Network (GERAN)
compliant base station comprising: a receiver configured to receive
a first data block associated with an uplink temporary block flow
(TBF), wherein the first data block includes a first header that
includes a temporary flow identity (TFI) that identifies the uplink
TBF; a processor configured to: generate a piggybacked
acknowledgement/non-acknowledgement (PAN) field corresponding to
the uplink TBF; generate a PAN check sequence (PCS) based on the
PAN field; mask a subset of PCS bits with the TFI to generate a
masked PCS; and generate a second data block, associated with a
downlink TBF, that includes a second header, a data part
corresponding to the downlink TBF, the PAN field, and the masked
PCS; and a transmitter configured to transmit the second data
block.
5. The base station of claim 4, wherein the subset of PCS bits is a
first N bits of the PCS bits, or a last N bits of the PCS bits.
6. The base station of claim 4, wherein the processor is further
configured to generate the PCS by performing cyclic redundancy
check (CRC) encoding with the PAN field.
7. A method for use in a Global System for Mobile Communication
(GSM)/Enhanced Data Rates for Global Evolution (EDGE) Radio Access
Network (GERAN) compliant base station, the method comprising:
transmitting a first data block associated with a downlink
temporary block flow (TBF), wherein the first data block includes a
first header that includes a temporary flow identity (TFI) that
identifies the downlink TBF; receiving a second data block
associated with an uplink TBF, wherein the second data block
includes a header, a data part corresponding to the uplink TBF, a
piggybacked acknowledgement/non-acknowledgement (PAN) field
corresponding to the downlink TBF, and a masked PAN check sequence
(PCS), wherein the masked PCS was masked with the TFI that
identifies the downlink TBF; and de-masking the masked PCS using
the TFI that identifies the downlink TBF.
8. The method of claim 7, wherein the de-masking further comprises:
de-masking the masked PCS using all TFIs identifying all TBFs
associated with the base station.
9. The method of claim 7, wherein the de-masking further comprises:
performing cyclic redundancy check (CRC) decoding with the PAN
field.
10. A Global System for Mobile Communication (GSM)/Enhanced Data
Rates for Global Evolution (EDGE) Radio Access Network (GERAN)
compliant base station comprising: a transmitter configured to
transmit a first data block associated with a downlink temporary
block flow (TBF), wherein the first data block includes a first
header that includes a temporary flow identity (TFI) that
identifies the downlink TBF; a receiver configured to receive a
second data block associated with an uplink TBF, wherein the second
data block includes a header, a data part corresponding to the
uplink TBF, a piggybacked acknowledgement/non-acknowledgement (PAN)
field corresponding to the downlink TBF, and a masked PAN check
sequence (PCS), wherein the masked PCS was masked with the TFI that
identifies the downlink TBF; and a processor configured to de-mask
the masked PCS using the TFI that identifies the downlink TBF.
11. The base station of claim 10, wherein the processor is further
configured to de-mask the masked PCS using all TFIs identifying all
TBFs associated with the base station.
12. The base station of claim 10, wherein the processor is further
configured to de-mask the masked PCS by performing cyclic
redundancy check (CRC) decoding with the PAN field.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 13/406,121, filed Feb. 27, 2012, which is a
continuation of U.S. patent application Ser. No. 12/056,433 filed
Mar. 27, 2008, which issued as U.S. Pat. No. 8,126,013 on Feb. 28,
2012, which claims the benefit of U.S. Provisional Application Nos.
60/908,535 filed Mar. 28, 2007, 60/945,057 filed Jun. 19, 2007,
60/944,982 filed Jun. 19, 2007, 60/945,034 filed Jun. 19, 2007, and
60/956,765 filed Aug. 20, 2007, all of which are incorporated by
reference as if fully set forth herein.
FIELD OF INVENTION
[0002] The present invention is related to a wireless communication
system.
BACKGROUND
[0003] Latency reduction is one of the considerations in a GSM/EDGE
radio access network (GERAN). Two techniques have been proposed for
the latency reduction: reduced transmission time interval (RTTI)
and fast acknowledgement/non-acknowledgement (ACK/NACK) reporting
(FANR).
[0004] Conventionally, an ACK/NACK report is sent in an explicit
message, also referred to as a radio link control/medium access
control (RLC/MAC) control block. The ACK/NACK report is addressed
to a particular radio resource, called a Temporary Block Flow
(TBF).
[0005] A TBF is a temporal connection between a mobile station and
a network to support a uni-directional transfer of data. A TBF is
temporary and is maintained only for the duration of the data
transfer. Each TBF is assigned a temporary flow identity (TFI) by
the network. The TFI is unique among concurrent TBFs in each
direction and is used instead of mobile station identity in the
RLC/MAC layer. The same TFI is included in every RLC header
belonging to a particular TBF.
[0006] It has been proposed to send the ACK/NACK report for a
certain TBF as a "piggyback" on an RLC/MAC data block that may be
addressed to another TBF. The field that carries the ACK/NACK
report is referred to as a piggybacked ACK/NACK (PAN) field.
[0007] Since the PAN field is included in a data block that may be
addressed to a different TBF, it is necessary to identify to which
TBF the PAN field is addressed. Various proposals have been made to
identify the correct TBF in the PAN field, including using a TFI or
an uplink (UL) state flag (USF). During establishment of the uplink
TBF, a USF is assigned to each mobile station. The USF is used by
the network to indicate which mobile terminal is allowed to
transmit in the following uplink radio block.
[0008] In either case, some number of bits, (typically ranging from
three to five), should be dedicated to the TBF identity in the PAN
field. It would be desirable to have an efficient method of sending
the TBF identity in the PAN field such that no dedicated bits are
needed to identify the TBF.
SUMMARY
[0009] A method and apparatus are described for indicating a TBF to
which a PAN field is addressed. A PAN check sequence (PCS) is
created, for example using a cyclic redundancy check (CRC)
encoding. The PCS is masked with a TFI assigned to a TBF or a mask
generated based on the TFI. A data block including the PAN field
and the masked PCS is then processed for transmission. The mask may
be generated by converting the TFI using an (M, N) code, M being
the number of bits of the PCS and N being the number of bits of the
TFI. With this scheme, a TFI may be transmitted in a PAN field
without using explicit bits to identify the TBF.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] A more detailed understanding may be had from the following
description, given by way of example in conjunction with the
accompanying drawings wherein:
[0011] FIG. 1 shows an example radio block;
[0012] FIG. 2 is an example block diagram of a transmitting
station; and
[0013] FIG. 3 is an example block diagram of a receiving
station.
DETAILED DESCRIPTION
[0014] When referred to hereafter, the terminology "wireless
transmit/receive unit (WTRU)" includes but is not limited to a user
equipment (UE), a mobile station (MS), a fixed or mobile subscriber
unit, a pager, a cellular telephone, a personal digital assistant
(PDA), a computer, or any other type of user device capable of
operating in a wireless environment. When referred to hereafter,
the terminology "base station" includes but is not limited to a
Node-B, a site controller, an access point (AP), or any other type
of interfacing device capable of operating in a wireless
environment.
[0015] FIG. 1 shows an example radio block 100. The radio block 100
for data transfer includes one RLC/MAC header 102, a header check
sequence (HCS) 104, one or more RLC data block(s) 106, a block
check sequence (BCS) 108, a PAN field 110, and a PCS 112. The
RLC/MAC header 102, the RLC data block(s) 106 and the PAN field 110
are coded separately for error detection and correction, and a
separate checksum, (e.g., a cyclic redundancy check (CRC)
checksum), is attached to each of them. The RLC/MAC header 102
contains a control field indicating whether a PAN field 110 is
included or not in the radio block 100. The HCS 104 is used for
error detection of the RLC/MAC header 102. The BCS 108 is used for
error detection of the RLC data block 106. A separate BCS may be
included for each RLC data block. The PAN field 110 contains
piggy-backed ACK/NACK information sent in one direction to provide
acknowledgement for a TBF in the other direction. The PCS 112 is
used for error detection of the PAN field 110.
[0016] FIG. 2 is an example block diagram of a transmitting station
200. The transmitting station 200 may be a WTRU, a Node-B, or any
other apparatus or device. The transmitting station 200 includes an
encoder 202, a masking unit 204, and a transceiver 206. A PAN field
is input into the encoder 202. The encoder 202 generates a PCS
based on the PAN field 201. For example, the encoder may be a
cyclic redundancy check (CRC) encoder and the PCS may be a CRC
checksum generated based on the PAN field 110. The masking unit 204
then masks the PCS with a TFI, (i.e., TFI is used as a mask). The
masking of the PCS bits with the TFI may be performed by modulo-2
addition, (i.e., an exclusive OR (XOR) operation). The transceiver
206 sends a data block 100 including the PAN field 110 and the
masked PCS 112. With this scheme, a TFI may be transmitted in a PAN
field without using explicit bits to identify the TBF. Before
transmission, a channel coding, (such as forward error correction
(FEC) coding, rate matching, interleaving, or the like), may be
performed.
[0017] At least one bit of the TFI is masked with at least one bit
of the PCS. For example, when the number of PCS bits (M) is greater
than the number of TFI bits (N), (e.g., N=5 and M=10), the TFI bits
may be mapped to a portion or all of the PCS bits, (e.g., first N
bits, last N bits, or a subset of the M bits). The opposite case is
also possible if N is greater than M.
[0018] Alternatively, the transmitting station 200 may include a
mask generator 208. The mask generator 208 generates a mask from
the TFI, and the masking unit 204 masks the PCS with the mask
generated by the mask generator 208. The N-bit TFI may be converted
into an M-bit mask using an (M, N) code, (M is the number of bits
of the PCS), and then the mask may be XORed with the PCS.
[0019] Alternatively, the N-bit TFI may be converted into an L-bit
mask using an (L, N) code, where L<M, (M is the number of bits
of the PCS), and then the mask may be XORed with the PCS. For
example, when the number of PCS bits (M) is greater than the number
of mask bits (L), (e.g., L=8 and M=10), the mask bits may be mapped
to a portion or all of the PCS bits, (e.g., first L bits, last L
bits, or a subset of the L bits). The opposite case is also
possible.
[0020] The M-bit mask may be selected to provide improved
separation, (e.g., Hamming distance), between the M bit sequences.
For example, it may be obtained by binary multiplying the N-bit TFI
with a generator matrix. A good masking code shall have the largest
possible minimum distance and the lowest frequency of occurrence of
this minimum value.
[0021] Example generator matrices of the linear binary codes with
maximal minimum distances are provided below. In these examples,
the TFI is assumed to be 5 bits long.
[0022] (1) A (6,5) code with minimum distance 2 (applicable if
M=6):
1 0 0 0 0 1 0 1 0 0 0 1 0 0 1 0 0 1 0 0 0 1 0 1 0 0 0 0 1 1 .
##EQU00001##
[0023] (2) A (7,5) code with minimum distance 2 (applicable if
M=7):
1 0 0 0 0 1 1 0 1 0 0 0 1 1 0 0 1 0 0 1 1 0 0 0 1 0 1 1 0 0 0 0 1 1
1 . ##EQU00002##
[0024] (3) An (8, 5) code with minimum distance 2 (applicable if
M=8):
1 0 0 0 0 1 1 0 0 1 0 0 0 1 0 1 0 0 1 0 0 0 1 1 0 0 0 1 0 1 1 1 0 0
0 0 1 1 1 1 . ##EQU00003##
[0025] (4) A (9, 5) code with minimum distance 3 (applicable if
M=9):
1 0 0 0 0 0 1 1 1 0 1 0 0 0 1 0 1 1 0 0 1 0 0 1 1 0 1 0 0 0 1 0 1 1
1 0 0 0 0 0 1 1 1 1 1 . ##EQU00004##
[0026] (5) A (10, 5) code with minimum distance 4 (applicable if
M=10):
1 0 0 0 0 0 1 1 1 1 0 1 0 0 0 1 0 1 1 1 0 0 1 0 0 1 1 0 1 1 0 0 0 1
0 1 1 1 0 1 0 0 0 0 1 1 1 1 1 0 . ##EQU00005##
[0027] (6) An (11, 5) code with minimum distance 4 (applicable if
M=11):
1 0 0 0 1 1 0 0 0 1 0 0 1 0 0 1 0 1 0 0 1 0 0 0 1 0 1 0 0 1 0 1 0 0
0 0 1 1 0 0 0 1 1 0 0 0 0 0 0 1 1 1 1 1 1 . ##EQU00006##
[0028] It should be noted that the above generator matrices are
provided as an example, not as a limitation, and any other
variances are also possible. For example, the matrices set forth
above may be pre-multiplied and post-multiplied by binary
permutation matrices, resulting in new matrices with the rows
and/or the columns permuted. This column and/or row permutation
will preserve the distance properties of the code.
[0029] FIG. 3 is an example block diagram of a receiving station
300. The receiving station 300 may be a WTRU, a base station, or
any other apparatus or device. The receiving station 300 includes a
transceiver 302, a de-masking unit 304, and a decoder 306. The
receiving station 300 may optionally further include a mask
generator 308. The transceiver 302 receives a radio block including
a PAN field and a masked PCS, such as the one shown in FIG. 1. The
transceiver 302 outputs the PAN field and the masked PCS. The
de-masking unit 304 de-masks the received masked PCS with its own
TFI assigned to a TBF or alternatively with a mask generated by the
mask generator 308 using its own TFI. The de-masking unit 304
outputs PAN bits and de-masked PCS bits. The decoder 306 then
computes a PCS, (e.g., CRC bits), based on the received PAN field
and compares the computed PCS with the de-masked received PCS. If
the two PCSs agree, then the received PAN field is declared to be
addressed to the receiving station 300. If the two PCSs do not
agree, the PAN field is declared to be not addressed to the
receiving station 300 and then may be discarded.
[0030] Alternatively, the decoder 306 may compute a PCS, (e.g.,
using CRC), and then mask the computed PCS with its TFI or a mask
generated based on the TFI and then compare the computed masked PCS
to the received masked PCS.
[0031] The receiving station 300 may need to decode the received
PAN against more than 1 stored TFIs because the receiving station
300 may be allocated more than one TBF, and each TBF has a TFI of
its own. When multiple TBFs are allocated to the receiving station
300, the receiving station 300 determines which TBF the PAN is
addressed by de-masking against each possible TFI corresponding to
its allocated TBFs.
[0032] Although features and elements are described above in
particular combinations, each feature or element can be used alone
without the other features and elements or in various combinations
with or without other features and elements. The methods or flow
charts provided herein may be implemented in a computer program,
software, or firmware incorporated in a computer-readable storage
medium for execution by a general purpose computer or a processor.
Examples of computer-readable storage mediums include a read only
memory (ROM), a random access memory (RAM), a register, cache
memory, semiconductor memory devices, magnetic media such as
internal hard disks and removable disks, magneto-optical media, and
optical media such as CD-ROM disks, and digital versatile disks
(DVDs).
[0033] Suitable processors include, by way of example, a general
purpose processor, a special purpose processor, a conventional
processor, a digital signal processor (DSP), a plurality of
microprocessors, one or more microprocessors in association with a
DSP core, a controller, a microcontroller, Application Specific
Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs)
circuits, any other type of integrated circuit (IC), and/or a state
machine.
[0034] A processor in association with software may be used to
implement a radio frequency transceiver for use in a wireless
transmit receive unit (WTRU), user equipment (UE), terminal, base
station, radio network controller (RNC), or any host computer. The
WTRU may be used in conjunction with modules, implemented in
hardware and/or software, such as a camera, a video camera module,
a videophone, a speakerphone, a vibration device, a speaker, a
microphone, a television transceiver, a hands free headset, a
keyboard, a Bluetooth.RTM. module, a frequency modulated (FM) radio
unit, a liquid crystal display (LCD) display unit, an organic
light-emitting diode (OLED) display unit, a digital music player, a
media player, a video game player module, an Internet browser,
and/or any wireless local area network (WLAN) or Ultra Wide Band
(UWB) module.
* * * * *