CA2447291C - Method and system for implicit user equipment identification - Google Patents

Method and system for implicit user equipment identification Download PDF

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Publication number
CA2447291C
CA2447291C CA 2447291 CA2447291A CA2447291C CA 2447291 C CA2447291 C CA 2447291C CA 2447291 CA2447291 CA 2447291 CA 2447291 A CA2447291 A CA 2447291A CA 2447291 C CA2447291 C CA 2447291C
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Prior art keywords
crc
data
modulo
field
packet
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CA 2447291
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French (fr)
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CA2447291A1 (en
Inventor
Nader Bolourchi
Stephen E. Terry
Stephen G. Dick
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Intel Corp
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InterDigital Technology Corp
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Priority to CA 2628685 priority Critical patent/CA2628685C/en
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/0061Error detection codes
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/09Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/37Decoding methods or techniques, not specific to the particular type of coding provided for in groups H03M13/03 - H03M13/35
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2612Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signaling for the administration of the divided path
    • H04L5/0092Indication of how the channel is divided
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A wideband code division multiple access (W-CDMA) user equipment (UE) operating in frequency division duplex mode for receiving data over at least one of a plurality of high speed (HS) shared control channels (SCCHs) is disclosed.
The UE includes means for monitoring the plurality of HS-SCCHs; means for receiving a packet over at least one of the plurality of HS-SCCHs; and means for determining whether a UE identification is present in the packet and whether a circular redundancy code (CRC) of the packet is correct by processing a mask field. The mask field has an N-bit CRC modulo 2 combined with an N-bit UE
identification.

Description

CA 02447291 2003-11-13 I-2-0218.1 WO

[0001] METHOD AND SYSTEM FOR
IMPLICIT USER EQUIPMENT IDENTIFICATION
[0002] BACKGROLTND
[0003] The present invcntion relates to the field of wireless communications.
One of the applications of the present invention is diirected to a downlink signaling approach employing a modified cyclic redundancy check for both data protection and unique/group UE identification.
[0004] Wiz=eless communication systems have become an integral link in today's modem telecommunications infrastructure. As such, they have become increasingly ~ relied upon not only to support voice communications, but also data communications.
Voice communications are relatively low-rate, symmetrical in the upstream and downstream bandwidths and are predictable in the amount of bandwidth required.
[0005] However, data communicntions can place severe burdens upon a telecommunication system, particularl.y a wireless telecommunieation system.
First, data communications can often require extremely high data rates. Second, the amount of bandwidth for a data related application can vary greatly from several kilohertz of bandwidth to several megahertz. Third, the amount of bandwidth in the upstream and downstream directions can be drastically different. For example, with a typical Internet browsing applicatioia, very little data is sent in the upstream direction while vast amounts of data are downloaded in the downstream direction. These factors can place severe constraints upon a wireless telecommunication system.
[0006] The Wideband CDMA (WCDMA) standard, as the leading global third generation (3G) (YMT-2000) standard, supports data rates up to 2 Mb/s ia indoor/small-cell-outdoor environments and up to 384 kb/switch wide-area coverage, as well as support for both high-rate packet data and high-rate circuit-switched data.
However to satisfy the future demands for packet-data services, there is a need for a substantial imcrease in this data rate, especially in the dov+rnlink. Higb speed downlink packet access (HSDPA) would allow WCDMA to support downlink peak data rates in the range of approximately 8-10 Mb/s for bcst-effort packet-data services. This I

AMENDED SHEET

~ - CA 02447291 2003-11-13 ~ fP~.~ p,S

' 7 lIw'1.`]~~' ~4'46'` . CI~'q~r~s~Cl0~3 I-z-oz i s.lwa rate is far beyond the I1vITT-2000 requirement of 2 Mb/s. It also enhances the packet-data capability in terms of lower delay and improved capacity.
[0007] One solution for supporting data communications is the allocation of dedicated channels to each user equipment (UE). However, this results in an extremely inefficient use of the bandwidth since such channels often remain idle for long durations.
[0008] An alternative to dedicated channels for each LTE is the use of the high speed shared data channels and the packeting of data. In this method, a plurality of high speed data channels are shared between a plurality of UEs. Those UEs having (1 data for transmission or reception are dynamically assigaed one of the shared data v channels. This results in a much more efficient use of the spectrpm.
[0009] One such process for assigning a high speed shared data channel when a base station has data waiting for transmission to a particular YJE is shown in Figs. l A-1 C. Refenring to Fig. I.A, an associated downlink dedicated physical channel (DPCH) is transmitted to each UE. The UE monitors associated downlink DPCH as well as the shared control channels (SCCH-HS). When there is no data being transmitted to the UE from the base station, the UE enters a standby mode whcreby it periodically "wakes up" to attempt to monitor its associated downli.nk DPCH as well as SCCH-HSs. This permits the UE to save processing and battery resources.
[00010] If data at the base station is ready for transmission to the UE, a High Speed Downlink Shared Channel (HS-DSCH) indicator (HI) is transmitted in the associated DPC.H. The HI has n-bit length, which points to one of 2n SCCH-HSs shown in Fig. 1B. For example, a 2 bit HI can point to 4 SCCH-HSs, i.e., 00, 01, 10 or 11.

[00011] For the examplc shown in Fig. lA., the HI is (1, 0) which points to the third channel shown in Fig. l B. When the CJE accesses the control channel identified by the HI, that particWar SCCH-HS will direct the iJL to the proper HS-DSCH, which has been allocated to the UE for reception of the data. As shown in Fig. 1C, for example, the UE tunes to HS-DSCH (001) that was identified by SCCH-HS (1, 0).

AMENDED SHEET

The UE then receives the data intended for it over the HS-DSCH (001). It should be noted that the graphical representation of Fig. lA-1 C has been presented to illustrate the process of assigning HS-DSCHs, and the configuration and use of channels may differ slightly from actual implementation in HSDPA standards.
[00012] The process as described with reference to Figs. 1A-1C provides an efficient method for assigning common data channels for transmission of data.
Since packet data is intended for one or more, specific UEs, the UE identity (ID) is a critical parameter for signaling from the base station to the UE.
[00013] There are several prior art methods for signaling the UE ID between the base station and the UE. Referring to Fig. 2A, the first method appends the UE
ID
onto the data for transmission. The combination is fed to a cyclic redundancy check (CRC) generator, which outputs a CRC. The resulting data packet, which is ultimately transmitted, includes an X-bit data field, an M-bit UE ID and an N-bit CRC as shown in Fig. 2B. Although this provides adequate signaling of both the CRC and the UE
ID, it is wasteful of signaling bandwidth.
[00014] Another prior art technique shown in Fig. 3A appends the UE ID onto the data field for input into the CRC generator. The CRC generator outputs a CRC.
As shown in Fig. 3B, the data burst for transmission includes an X-bit data field and an N-bit CRC field. Although this also adequately signals the UE ID and the CRC
between the base station and the UE, it is undesirable since it can only be used for unique UE identification. This method also causes increase complexity of UE
when a group UEs need to be identified.
[00015] SUMMARY
[00016] The present invention discloses several implementations for data related downlink signaling. The embodiments disclose selectively tailoring the UE ID
to create a UE ID value, which is then modulo 2 added to a data field to create a data mask. This data mask may be further processed as the CRC field. The CRC field is then transmitted with the data burst to provide CRC-related functions. An alternative embodiment discloses initializing a CRC generator with UE identification prior to CRC
generation. This implicitly includes the UE ID within the CRC without requiring additional overhead signaling.
[00017] A wideband code division multiple access (W-CDMA) user equipment (UE) operating in frequency division duplex mode for receiving data over at least one of a plurality of high speed (HS) shared control channels (SCCHs) is disclosed. The UE
includes means for monitoring the plurality of HS-SCCHs; means for receiving a packet over at least one of the plurality of HS-SCCHs; and means for determining whether a UE
identification is present in the packet and whether a circular redundancy code (CRC) of the packet is correct by processing a mask field. The mask field has an N-bit CRC
modulo 2 combined with an N-bit UE identification.

BRIEF DESCRIPTION OF THE DRAWING(S) [00018] Figs. lA-1C represent a prior art method for assigning shared data channels, where Fig. lA illustrates the associated downlink channel, Fig. 1B illustrates a plurality of control channels and Fig. 1C illustrates a plurality of data channels.
[00019] Fig. 1D is a block diagram of the universal mobile telecommunication system network architecture.
[00020] Fig. 2A is a prior art user equipment identification (UE ID) specific cyclic redundancy check (CRC) method.
[00021] Fig. 2B illustrates the transmitted data burst including a data field, a UE ID
field and a CRC field.
[00022] Fig. 3A is a second prior art user equipment identification (UE ID) specific cyclic redundancy check (CRC) method.
[00023] Fig. 3B illustrates the transmitted data burst including a data field and a CRC
field.
[00024] Fig. 4A is a first embodiment of the present invention utilizing modulo 2 addition of the UE ID with the CRC to create a mask.
[00025] Fig. 4B is a data burst transmitted by the system of Fig. 4A including a data field and a mask field.
[00026] Fig. 5A is a second embodiment of the present invention including a CRC
generator which is initialized using the UE ID.
[00027] Fig. 5B is a data burst transmitted by the embodiment of Fig. 5A
including a data field and a CRC field.
[00028] Fig. 6A is a third embodiment of the present invention which modulo 2 adds the data field to a UE ID field padded with trailing zeros to create a mask.
[00029] Fig. 6B is a fourth embodiment of the present invention which modulo 2 adds the data field to a UE ID field padded with leading zeros to create a mask.
[00030] Fig. 6C is the data burst transmitted by the embodiments of Fig. 6A
and 6B including a data field and a CRC field.
[00031] Fig. 7 A is a fifth embodiment of the present invention which modulo 2 adds the data field to a UE ID field repeated and padded a truncated UE ID in the trailing bits.
[00032] Fig. 7B is a sixth embodiment of the present invention which modulo 2 adds the data field to a UE ID field repeated and padded a truncated UE ID in the leading bits.
[000331 Fig. 7C is the data burst transmitted by the embodiments of Fig. 7A
and 7B including a data field and a CRC field.
[00034] Fig. 8 is a tabulation of global, subset, subsubset and unique IDs.
[00035] Fig. 9 is a flow diagram of the processing of a message in accordance with the present invention.

[00036] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) [00037] The presently preferred embodiments are described below with reference to the drawing figures wherein like numerals represent like elements throughout.
[00038] Referring to Fig. 1D, a Universal Mobile Telecommunications System (UMTS) network architecture used by the present invention includes a core network (CN), a UMTS Terrestrial Radio Access Network (UTRAN), and a User Equipment (UE). The two general interfaces are the Iu interface, between the UTRAN and the core network, as well as the radio interface Uu, between the UTRAN and the UE.
The UTRAN consists of several Radio Network Subsystems (RNS). They can be interconnected by the Iur interface. This interconnection allows core network independent procedures between different RNSs. The RNS is further divided into the Radio Network Controller (RNC) and several base stations (Node-B). The Node-Bs are connected to the RNC by the Iub interface. One Node-B can serve one or multiple cells, and typically serves a plurality of UEs. The UTRAN supports both FDD
mode and TDD mode on the radio interface. For both modes, the same network architecture and the same protocols are used. Only the physical layer and the air interface Uu are specified separately.

[00039] Referring to Fig. 4A, one embodiment of the present invention is shown.
In this embodiment, the system 100 utilizes the data for transmission (hereinafter referred to as "data") from the data field 102, a CRC generator 104 (which has been initialized to zero), the resulting CRC from the CRC field 106 output from the CRC
generator 104, the UE ID from the UE ID field 108, a modulo 2 adder 110 and a mask 112. It should be noted that in this embodiment and all of the embodiments described hereinafter, the number of bits of each field is noted above the field as an example.
However, the specific number of bits is exemplary and should not be construed to limit the present invention.

[00040] The system 100 receives the data field 102 and inputs the data from the data field 102 into the CRC generator 104. The CRC generator 104 generates the CRC field 106 and outputs the CRC from the CRC field 106 to a first input of the modulo 2 adder 110. The UE ID from the UE ID field 108 is output to the second input to the modulo 2 adder 110. The CRC and UE ID are then modulo 2 added to create a mask 112.
[00041] Preferably, the number of bits of the UE ID field 108 (M bits) is the same as the number of bits of the CRC field 106 (N bits). If M=N, then the UE
ID
may be directly modulo 2 added to the CRC as shown in Fig. 4A. However, if M
and N are not equal, then an interim step is necessary to make them equal. If M<N, then the UE ID is padded with either leading zeros or trailing zeros to be equal in length to the CRC. This "padded UE ID" is N modulo 2 added to the CRC 106. If M>N, then the least significant M-N bits are truncated from the UE ID . The truncated UE
ID is then modulo 2 added to the CRC .

[00042] Referring to Fig. 4B, the mask 112 that is generated is appended to the data field 102 for transmission.

[00043] Referring to Fig. 5A, a second embodiment of the present invention is shown. In this embodiment, the system 200 utilizes the data from the data field 202, a CRC generator 204, the UE ID from the UE ID field 208, and the resulting CRC
field 212. The system 200 receives the data field 202 and outputs the data from data field 202 into the CRC generator 204. The CRC generator 204 is the same type of generator as the CRC generator 104 from Fig. 4A, except that the CRC generator is initialized with the UE ID from the UE ID field 208. This initialization is illustrated by the dotted line in Fig. 5A. As is well known by those of slcill in the art, a CRC
generator is typically initialized to all zeros, as was the case with the CRC
generator 104 shown in Fig. 4A. Accordingly, the CRC generator 204 generates a CRC based upon the input data from the data field 202 and the initialization of the CRC
generator 204 with UE ID. No modulo 2 addition is required in this embodiment.
[00044] Preferably, the number of bits of the UE ID from the UE ID field 208 (M bits) is the same as the size of the CRC generator 204, although this is not necessary. If the size of the UE ID(M-bits) is less than the size of the CRC
generator 204, then the UE ID may be padded with either leading zeros or trailing zeros to be equal in length to the size of the CRC generator 204. This "padded UE ID" may then be used to initialize the CRC generator 204. Alternatively, the value in the UE ID
field 208 maybe loaded to initialize the CRC generator 204, and any bit positions not filled by the UE ID would be zero. If the size of the UE ID(M bits) is greater than the size of the CRC generator 204, then the least significant bits are truncated from the UE
ID in order to fit the UE ID to CRC generator 204. The truncated UE ID is then used to initialize the CRC generator 204.
[00045] Referring to Fig. 5B, the CRC field 212 that is generated is appended to the data field 202 for transmission.

[00046] This second embodiment of the present invention utilizing implicit UE
ID presents a simplistic, yet robust, alternative since it does not require assembly and disassembly of the UE ID with the SCCH-HS, at the transmitter or the receiver, as required by UE-specific CRC methods of the prior art and the first embodiment.

~ CA 02447291 2003-11-13, .wE~õ'V

1-2-0218.1 W<? P1~' `f .=' l.l- SI.7 ~ ,.. ' .3, ,1" 4GS .070~ eou n:3 [00047] Referring to Fig. 6A, a third embodiment of the present invention is shown. In this embodiment, the system 300 uWizes the data from the data field 302, the UE ID from the UE ZD field 308A, a znodulo 2 adder 310 and a mask 311, a CRC
generator 304 and the resulting CRC field 312. The system 300 reccives the data field 302 and inputs the data from the data field 302 into a first input of the modulo 2 adder 310. The UE ID from UE ID field 308A is output to the second input to the modulo 2 adder 310. Accordingly, the data from the data field 302 and the UE ID from the UE
ID field 308A are modulo 2 added to create a mask 311. The mask 311 is input into the CRC generator 304 which generates a CRC field 312.
[00048] In this embodiment, the number of bits of the UE ID field 308A (M
bits) must be the same as the number of bits (X bits) of the data field 302 in order to perform the modulo 2 addition. If M and X are equal, then the value from the UE 1I) field 308A may be directly modulo 2 added to the data from the data field 302 .
However, if M and X are not equal, then an interim step is necessary to make them equal. IfM is less than X then the TJE ID is padded with X-M trailing zeros such that the value from the UE ID field 308A is equal in length to the data field 302.
This "padded UE ID value" as shown in Fig. 6A is then modulo 2 added to the data from the data field 302.
~ [00049] Due to the length X ofthe data field 302, it is not expected that M
will be greater than X. However, if this were to occur, then the least signifiicant M-X bits are truncated from the value in UE ID field 308A. The truncated UE ID is then modulo 2 added to the data from the data field 302.
[000501 Referring to Fig. 6B, a fourth embodiment of the present invention is shown. In this embodiment, the system 301 operates in the exact same manner as the third embodiment shown in Fig. 6A. The only difference in this embodiment-is the method in which the value from the UE ID field 308B is generated. In this ernbodiment, the UE ID is padded with X-M leading zeros such that the UE Ir) from the UE ID field 308B is equal in length to the data field 302. This "padded UE
ID
valud', as shown in Fig. 6B, is then modulo 2 added to the data from the data field AMENDED SHEET

---~---- - -CA 02447291 2003-11-13 1PCA/~~s ~,~ V

I-2-0218.1 Wo P C: T. /U S 0 Li= 5 - 0 7 9:I 4 ' I:I CI :3 302. It should be noted that the padding may alternatively comprise a combination of .
leading and trailing zeros (not shown) in order to make the UE ID the same length as the data field.
[00051] Referring to Fig. 6C, the CRC field 312 that is generated from the system 300 of the third embodiment shown in Fig. 6A, or the CRC 314.that is generated from the system 301 of the fourth embodiment shown in Fig. 6B, is appended to the data field 302 fortransmission. Accordingly, either type of CRC field 312, 314 may be used and appended ont,o the data field 302.
[00052] Referring to Fig. 7A, a fi8h embodiment of the present invention is shown. In this embodimcnt, the system 400 utilizes the data from the data field 402, the UE ID from the UE ID field 408A, a modulo 2 adder 410, a mask 411, a CRC
generator 404 and the resulting CRC field 412. The system 400 rcceives the data field 402 and inputs the data from the data field 402 into a first input of'the modulo 2 adder 410. The UE ID from UE fD field 408A is output to the second input to the mdulo 2 adder 410. The data from the data field 402 and the UE 11) from the UE ID
field 408A
are rnodulo 2 added to create a mask 411. The mask 411 is input into the CRC
generator 404, which generates the CRC field-412.
[00053] In this embodiment, the number of bits of the UE ID field 408A (M
bits) must be the same as the number of bits of the data field 402 in ordcr to perform the modulo 2 addition. If the M is equal to X, then the UE ID from the UE ID field may be directly modulo 2 added to the data from the data field 402. Due to the length of the data field 402, it is not expected that M will be greater than X.
However, ifthis were to occur, then the least siguificant bits are truncated fxom the UE ID
field 408A
until the length of the UE ID field is equal to X. The truncated UE ID is then modulo 2 added to the value from the data field 402. - .

[00054] If the length of the UE ID is shortcr than the data field 402, then a "composite UE ID" is creatcd such that the value fmm the UE ID field 408A is equal to X. The composite UE ID is created by repeating the UE ID as many times as it will fit within an X-bit field, then filling in the remainitng trailing bits with a truncated UF, AMENDED SHEET

ID. This is represented in the UE ID field 408A in Fig. 7A. The composite UE
ID is then modulo 2 added to the data from the data field 402.

[00055] Referring to Fig. 7B, a sixth embodiment of the present invention is shown. The system 401 of this embodiment operates in the same manner as the fifth embodiment shown in Fig. 7A. The only difference in this embodiment is the value from the UE ID field 408B. Although the composite UE ID created in the same manner as in Fig. 7A, the truncated UE ID portion is added as leading bits, as opposed to the trailing bits in the UE ID field 408A shown in Fig. 7A. It should be noted that the truncated UE ID"padding" may include a combination of leading and trailing truncated bits in order to make the UE ID the same length as the data field 402.

[00056] Referring to Fig. 7C, the CRC field 412 that is generated from either the system 400 of the fifth embodiment shown in Fig. 7A, or the CRC field 414 that is generated from the system 401 of the sixth embodiment shown in Fig. 7B, is appended to the data field 402 for transmission. Accordingly, either type of CRC field 412, 414 may be used and appended onto the data field 402.
[00057] It should be noted that all of the above-described embodiments can be used to support multiple identities (IDs). A UE may be required to process messages addressed at several levels: 1) the UE's unique ID, 2) an ID corresponding to a subset or group of UEs, where the UE belongs to the subset; or 3) a broadcast (global ID) corresponding to all UEs in the system. For example, as shown iui Fig. 8, UE

has been highlighted to indicate that it will able to receive and process IDs at four different levels: 1) the UE-specific ID(#12); 2) subsubset C ID; 3) subset 2 ID; and 4) global ID. It should also be noted that alternate group identifications A-E, may also be created such that a different group of UEs maybe included. For example, group B
will include all of the UEs identified next to group B which include UE
numbers 2, 7, 12, 17, 22 and 27. Additionally, any group or subgroup maybe created by specifically identifying individual UEs as desired by a user.

CA 02447291 2003-11-13. PLR Q

I-2-0218.1W0 f'.1 i 04i'r."" 00;w1 [00058] To support this requirement, the transmitter generates the CRC as deseribed above with each of the embodiments. At the receiver, the UE
processes the message and generates the expected CRC, without the ID-based modification. The UE
processor then modulo 2 adds the received CRC to the calculated CRC. The resultant output is the transmitted ID, which can be any one of the TDs described above.
If the ID is none of these, then the UL discards the transmission.
[00059] In accordance with the present invention, using the CRC code of the length N, the undetected error probability on the iden fified SCCH-HS
approaches 2-N.
Using a 24-bit CRC to protect data transinitted on HS-DSCH, a 16-bit CRC to protect control infommtion transmitted on SCCH-HS, and assuming 1O-3 false acceptance probability for HI bits by an unintended UE, the embodiments in accordance with the present invention hereinbefore described will provide the probability of the false acceptances as follows:
Pfa = P faHI x P faH x PSD Equation (1) where Pfa is the probability of a false acceptance; P faHI is the probability of a false acceptance of HI; PfaH is the probability of a false acceptance of SCCH-HS;
and PSD
is the probability of a successful detection of HS-DSCH (PSD).
[00060] Using the above identified values for the present exannple with Equation [00061] Pt. =10'x246 x2-21 = 9.1 x 10-16 [00062] The reliability computation indicates that for the same length CRC, the probability of a user passing erroneous data up to a higher layer, will be extremely low.
(00063] Referring to Fig. 9, the flow diagram illustrates a method for processing downlin.k messages between a node B and a UE in accordance with the present invention. Tlais method provides a general overview and should not be interpreted as a comprehensive description of all of the detailed medium access control (MAC) layer and physical layer signaling required for processing a message, (i.e., a data packet).
The node B first generates a downlink control message in the MAC layer (step 1) and AMENDED SHEET

then forwards the message and the UE ID to the physical layer (step 2). The physical layer generates the CRC and applies the UE ID for forwarding with the message (step 3) as a data burst. The message is then transmitted from the node B to the UE
(step 4).
At the physical layer, the UE ID and the CRC are checked to determine if they are correct (step 5). If so, the message is forwarded to the MAC layer (step 6) which then further processes the message (step 7).

[00064] It should be noted that step 6 in Fig. 9 includes an additional signal between the physical layer and the MAC layer, which comprises a control message that indicates the CRC/UE ID is valid. However, this is an optional step. In the preferred embodiment, only valid messages will be forwarded from the physical layer to the MAC layer. Accordingly, in the preferred embodiment, the MAC layer will assume that any message that is forwarded to the MAC is valid. In the alternative embodirnent, the additional CRC/iJE ID valid signaling will be forwarded along with the message as an additional confirmation.

[00065] The present invention has the advantage of eliminating separate processing steps for the UE ID and the CRC. When the two fields are combined as hereinbefore described, the UE will not further process any message until both the CRC and the UE II) (or other type of ID shown in Fig. 8) are correct.

[00066] While the present invention has been described in terms of the preferred embodiment, other variations, which are within the scope of the invention, as outlined in the claims below will be apparent to those skilled in the art.

Claims (6)

What is claimed is:
1. A wideband code division multiple access user equipment (W-CDMA UE) operating in frequency division duplex (FDD) mode for receiving data over at least one of a plurality of high speed (HS) shared control channels (SCCHs), the W-CDMA UE
comprising:

means for monitoring the plurality of HS-SCCHs;
means for receiving a packet over at least one of the plurality of HS-SCCHs, the packet having control data and a mask field;

means for determining whether a UE identification (ID) of the W-CDMA UE is present in the packet and whether a circular redundancy code (CRC) of the packet is correct by processing the mask field, the mask field having an N-bit CRC modulo 2 combined with an N-bit UE identification; and means for forwarding the control data to a media access control (MAC) layer when the UE ID of the W-CDMA UE is present and the CRC is correct.
2. The W-CDMA user equipment of claim 1 wherein the modulo 2 combining is performed by a modulo 2 adder.
3. A wideband code division multiple access (W-CDMA) base station operating in frequency division duplex (FDD) mode for transmitting data over a plurality of high speed (HS) shared control channels (SCCHs), the W-CDMA base station comprising:
means for receiving control data from a media access control (MAC) layer;
means for producing an N-bit circular redundancy code (CRC) from the received control data;

means configured to receive the N-bit CRC and an N-bit user equipment (UE) identification (ID) modulo 2 combine the N-bit CRC with the N-bit UE ID to produce a mask field;

means for attaching the mask field to the control data to produce a data packet; and means for transmitting the data packet over one of the plurality of HS-SCCHs.
4. The W-CDMA base station of claim 1 wherein the modulo 2 combining is performed by a modulo 2 adder.
5. A method for receiving data over at least one of a plurality of high speed (HS) shared control channels (SCCHs) by a wideband code division multiple access user equipment (W-CDMA UE) operating in frequency division duplex (FDD) mode, the method characterized by comprising:
monitoring the plurality of HS-SCCHs;
receiving a packet over at least one of the plurality of HS-SCCHs, the packet having control data and a mask field;
determining whether a UE identification (ID) of the W-CDMA UE is present in the packet and whether a circular redundancy code (CRC) of the packet is correct by processing the mask field, the mask field having an N-bit CRC modulo 2 combined with an N-bit UE
identification; and forwarding the control data to a media access control (MAC) layer when the UE
ID of the W-CDMA UE is present and the CRC is correct.
6. The method of claim 5 wherein the modulo 2 combining is performed by a modulo 2 adder.
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