Exhibit 1003
`Exhibit 1003
`
`ZTE Corporation and ZTE (USA) Inc.
`ZTE Corporation and ZTE (USA) Inc.
`
`

`

`Inv. No. 337-TA-868
`RX-3425
`
`TSG-RAN Working Group 1 #30
`San Diego, USA
`January 7-10, 2003
`
`Source:
`
`Siemens
`
`Tdoc RI-030004
`
`Title:
`
`Downlink Control Channel Configuration for Enhanced Uplink Dedicated Transport
`Channel
`
`Agenda Item:
`
`AH 64 (Enhanced Uplink DCH)
`
`Document for:
`
`Discussion and Decision
`
`1. Introduction
`
`In 3GPP TSG RAN WGl a feasibility study on enhanced uplink dedicated Transport Channel (denoted as EU-
`DCH in the sequel) for UTRA FDD has started. The general idea of this study is to investigate performance
`enhancement techniques, like adaptive modulation and coding, HARQ and fast scheduling in combinations with
`shorter frame sizes. In this paper possible co~ffigurations of the associated downlink control channel are
`addressed. In particular the re-use of HS-SCCH versus the definition of a uew shared control chmmel is
`discussed.
`
`2. Re-use of HS-SCCH
`
`Re-using the existing HSDPA downlink control channel (HS-SCCH) is a means to alleviate the downlink code
`resource problem by providing trunking gain between EU-DCH and HS-DSCH users. This is achieved by
`reusing the downlink HS-SCCH also for downlink control information of EU-DCH (denoted as EU-SCCH in the
`sequel). Consequently, EU-SCCH uses also a 3-slot format and is time-aligned at Node B with HS-SCCH
`t~ansmissions. This particular format for EU-DCH associated downlink control fifformation allows the same
`shared control channel to bc used for EU-DCH and HSDPA users in time multiplex. Downlink code resources
`are saved, since the Node B has more flexibility in HS-SCCH~U-SCCH usage and can more often assure that
`d~e codes allocated to HS-SCCH and EU-SCCH are t\dly utilised in the time domain. The number of HS-SCCH
`channels is adopted to the joint traffic of HSDPA and EU-DCH. Additionally it decreases UE complexity, since
`less control channels need to be monitored in cases where HS-DSCH and EU-DCH are used concurrently.
`
`A fitrther snnphficatmn of the LIE ~mplementahon is possible ff exactly the coding t~rmat of IIS-SCCII part 1 ~s
`re-used. This is possible if the signalling payload is four bits or less. As shown in Fig. 1, the HS-SCCH part 1
`provides 8 unused codewords within the channelisaLion code-set field (denoted as "redundant area" in Fig. 1,
`[1]), whicl~ could be used for El J-DC[I downlink signalling.
`
`Tree offset indicator (4 bits)
`0 1 2 3 4 5 6 Y 8 9 10 11 12 13 14 15
`
`Decoding notation
`
`~.~_~ Number of
`multi codes
`0ffsel from
`lefli~ght in code
`1tee (SF=16)
`
`0 [1/15)
`
`1~2/14)
`
`2 [3/13)
`
`~ ~4/1;)
`
`415/11)
`
`516/10/
`
`6 [7N)
`
`Fig 1: Reuse of the redundant area of HS-SCCH part 1 for downlink signalling of EU-DCH
`
`Page 1 of 2
`
`NK8681TC015910712
`ZTE Corporation and ZTE (USA) Inc.
`Exhibit 1003-00001
`
`

`

`Furthermore, the modulation bit of HS-SCCH part 1 can be used for different purposes in EU-DCH1. A major
`benefit of the re-use of HS-SCCH channel and coding format is that the detection based on the implicit UE-ID
`and decoding of part 1 is identical for HSDPA and EU-DCH data transmission and receiver implementation is
`notably simplified. Note, that current proposals differ significantly in the number of required downlink signalling
`bits [2, 3]. If the total downlink signalling payload is less or equal to four bit, only part 1 could be used.
`
`3. New Downlink Shared Control Channel
`
`Another alternative is to define a new shared control channel for EU-DCH. In this case no trunking gain is
`obtained and additional downlink code resources are required. However, in this case the format and coding of
`this control charmel can be optimised for the payload size. In particular if few downlink signalling bits are
`required, higher spreading factors (e.g., SF = 256 or 512) than applied to HS-SCCH can be used and/or shorter
`sub-frame duration can be adopted (which allows to accommodate more users per channel in time-multiplex).
`Thus the total code consumption of this alternative might not be significantly higher than of re-using HS-SCCH.
`Note, that anyhow, it is favourable not to schedule too many EU-DCH users concurrently to keep the dynamics
`of the noise rise within feasible limits. The main benefit of this approach is that the detection and decoding
`performance of this control channel can be optimised for the given payload and that it is not related to the
`performance of HS-SCCH. Another benefit is, that a separate downlink control channel would allow higher
`flexibility in relative channel timing, the resulting round trip delay, and available processing times at UE and
`Node B.
`
`4. Conclusions
`
`This paper investigates different possibilities for configuration of the downlink control cl~nnel for EU-DCH.
`The re-use of HS-SCCH for EU-DCH downlink signalling is compared to the definition of a new shared channel
`with higher spreading factor and/or shorter frame size. The former strategy offers trunking gain between HSDPA
`and EU-DCII operation, i.e., improves downlink code consumption. A further advantage is t~at the detection
`based on the implicit UE-ID and decoding is identical for HSDPA and EU-DCH. Thus receiver implementation
`is notably simplified. However, if a new shared downlink channel for downlink control signalling is used, the
`foi~nat and coding can be optinfised for the given payload size. Depending on the payload size, higher spreading
`factors (e.g., SF = 256 or 512) or shorter sub-frame duration can be adopted. Thus the total code consumption of
`this approach might not be significantly higher. The preference for one of these two possibilities will mainly
`depend on the size of the downlink control signalling payload.
`
`References
`
`[1]
`
`[2]
`
`[~]
`
`3GPP TSG RAN WG 1 Tdoc R1-02-0018, Nokia, "Compact signalling of multi-code allocation for
`HSDPA, version 2," Espoo, Finland, January 2002,
`
`3GPP TSG RAN WG 1 Tdoc R1-02-1277, Nokia, "Two Threshold Node B Packet Scheduling,"
`Shanghai, China, November 2002,
`
`3GPP TSG RAN WG 1 Tdoc R1-02-1350, Motorola, "Design Considerations for Enhanced Uplink
`Dedicated Channel," Shanghai, China, November 2002.
`
`1 If fast CQI signalling is adopted the number of available codewords is slightly less than 16.
`
`Page 2 of 2
`
`N K8681TC015910713
`ZTE Corporation and ZTE (USA) Inc.
`Exhibit 1003-00002
`
`