WO2008128481A1 - Signature sequence distributing method on e-hich channel - Google Patents

Signature sequence distributing method on e-hich channel Download PDF

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Publication number
WO2008128481A1
WO2008128481A1 PCT/CN2008/070790 CN2008070790W WO2008128481A1 WO 2008128481 A1 WO2008128481 A1 WO 2008128481A1 CN 2008070790 W CN2008070790 W CN 2008070790W WO 2008128481 A1 WO2008128481 A1 WO 2008128481A1
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WIPO (PCT)
Prior art keywords
feature code
sfn
sequence
hich
hich channel
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PCT/CN2008/070790
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English (en)
French (fr)
Inventor
Aimin Zhang
Zhiqun Chen
Yanshan Shi
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Spreadtrum Communications Shanghai Co Ltd
Spreadtrum Communications Corp
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Spreadtrum Communications Shanghai Co Ltd
Spreadtrum Communications Corp
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Publication of WO2008128481A1 publication Critical patent/WO2008128481A1/zh
Priority to US12/605,019 priority Critical patent/US8305982B2/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607Details of the supervisory signal
    • H04L1/1692Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/16Code allocation

Definitions

  • the present invention relates to a feature code allocation method in a wireless communication system, and more particularly to a method for allocating feature codes in an E-HICH channel for transmitting feedback information to an E-DCH channel in a TD-SCDMA system.
  • the High Speed Uplink Packet Access (HSUPA) technology was introduced for the 1.28Mcps option (ie TD-SCDMA system).
  • the main feature of this technology is the introduction of enhanced uplink dedicated transmission.
  • E-DCH enhanced dedicated channel
  • several related physical channels and adopts technologies such as fast Node-B scheduling and hybrid automatic repetition request (HARQ), so that the uplink capacity can be greatly improved.
  • HARQ hybrid automatic repetition request
  • the HSUPA can be divided into two modes according to the manner in which the UE sends the uplink service in a pre-allocated or temporary manner.
  • the first mode is the scheduling mode. In this mode, the UE sends uplink data on the E-DCH channel each time. Is transmitted on the corresponding physical channel according to the indication of the NodeB (base station) on the E-AGCH channel; the other mode is the non-scheduling mode, in which the NodeB allocates the E-DCH channel to the UE.
  • the UE is also assigned a fixed physical channel, so the UE does not need to listen to the E-AGCH channel.
  • the downlink physical channels involved in the HSUPA include an E-DCH Absolute Grant Channel (E-AGCH) and an E-DCH HARQ Indicator Channel (E-DCH HARQ Indicator Channel, E-HICH); related uplink physical channels include E-DCH Physical Uplink Channel (E-PUCH), E-DCH Uplink Control Channel (E-UCCH) ⁇ E-DCH Random Access Uplink Control Channel (E-RUCCH).
  • E-AGCH is used by the NodeB to send scheduling signaling, and the scheduling signaling includes parameters such as a UE identifier and a physical channel parameter.
  • the E-AGCH also sends a power control and a synchronization control command to the E-PUCH channel.
  • the E-HICH is used to send feedback information to the E-DCH channel.
  • the E-HICH also uses the channel to send commands such as uplink power control (TPC) and uplink synchronization control (SS);
  • TPC uplink power control
  • SS uplink synchronization control
  • the E-UCCH is used to send signaling related to the uplink E-DCH transmission;
  • the PUCH is used to send data of the E-DCH and the E-UCCH;
  • the E-RUCCH is used by the UE to request physical resources from the network side.
  • the HSUPA process includes the following steps:
  • the NodeB sends the identity of the UE and related physical channel parameters on the E-AGCH.
  • E-UCCH Control information
  • the corresponding signature is used to send feedback information.
  • the feedback information includes Acknowledgement (ACK) or Negative Acknowledgement (NAK).
  • ACK Acknowledgement
  • NAK Negative Acknowledgement
  • the non-scheduling mode is different from the scheduling mode.
  • the main difference is: In the non-scheduled mode, the physical channel used by the UE to send E-DCH data is pre-assigned by the NodeB, so there is no need to monitor the E-AGCH channel; In addition to the need to feed back ACK/NAK information on the E-HICH, the NodeB needs to feed back the power control and synchronization control commands for the E-PUCH channel.
  • the feedback information of the NodeB to multiple UEs is transmitted on the E-HICH, and the feedback information of different UEs is spread using different "signature sequence", because the feature code is selected and allocated.
  • the physical channel (E-PUCH) parameters of the UE for transmitting E-DCH data are in one-to-one correspondence, so each UE can know its own signature according to the physical channel allocated to itself, thereby being on the E-HICH channel. Detect the feedback you sent yourself.
  • the feature code is taken from an orthogonal matrix C 8Q of size 80x80, and the kth of the matrix acts as the kth feature code. Therefore, the length of each feature code is 80 bits, and the sequence number of the feature code is equal to its matrix C 8 ( The corresponding line number in ).
  • the NodeB For the scheduling mode, the NodeB sends feedback information ACK/NAK to the E-DCH data sent by the UE on the E-HICH channel, and the encoded feedback information is 1 bit, and the feedback information of the NodeB to the UE is Using the signature code C 8 corresponding to the UE ( after spreading, QPSK modulation is performed, and after spreading by the spreading code, the feedback information of each UE is superimposed and transmitted.
  • C 8 representing the r-th signature code, r is determined by the following formula:
  • t Q is the first (lowest numbered) slot number assigned to the UE for transmitting E-DCH data, which is taken
  • the value range is 1, 2, ..., 5
  • Q Q is the spreading factor allocated to the UE for transmitting E-DCH data at time slot t Q , which ranges from 1, 2, 4, 8 , 16
  • q Q is the assigned code channel number, the value range is 1, 2, ..., Qoo
  • the NodeB not only sends feedback information ACK/NAK to the E-DCH data sent by the UE on the E-HICH channel, but also feedbacks power control (TPC) and synchronization control information (SS) for the E-DCH channel.
  • TPC power control
  • SS synchronization control information
  • 80 signature codes are equally divided into 20 groups, each group consisting of 4 signature codes.
  • the first feature code in each group is used for the spread of the feedback information ACK/NAK, and the remaining three code codes and their complements are composed of 6 codes for representing 6 states of TPC/SS, and each state can be Identified with 1 bit.
  • the NodeB After the NodeB spreads the feedback information of the UE and the TPC/SS command with the corresponding feature code, QPSK modulation is performed, and after the spread spectrum code is spread, the feedback information of each UE is superimposed and transmitted. For the non-scheduled mode, the UE's signature allocation is informed by higher layer signaling rather than a fixed formula.
  • E-HICH channel feature code allocation that, for the scheduling mode, after the physical channel allocated to the UE for transmitting E-DCH data is fixed, the signature is fixed; for the non-scheduled HSUPA process, After the high-level signaling assigns a signature to the UE, its signature will remain unchanged during the HSUPA process.
  • the cross-correlation of the signatures is found.
  • the cross-correlation values obtained are related to the sequence numbers of the two codes.
  • the difference between the sequence numbers is less than or equal to 8
  • two The cross-correlation value between the codes is large, and when it is greater than 8, the cross-correlation is small. This property is related to the construction of the signature.
  • the wireless channel is usually a multipath channel, that is, the signal received by the receiving end is superimposed by different delays on the signal sent by the transmitting end, which results in Inter Symbol Interference (ISI) of the receiving signal, and the receiving end
  • ISI Inter Symbol Interference
  • the receiving end Before performing signal detection, it is usually necessary to use an equalizer to equalize the received signal to reduce ISI, thereby improving detection performance.
  • the actual equalizer delay is limited, and after equalizing the received signal, it is impossible to completely eliminate ISI. At this time, if the cross-correlation performance of the two signals is not good, the error detection rate of the feedback information sent to it by the receiving end of each UE is high.
  • the technical problem to be solved by the present invention is to provide a feature code allocation method for an E-HICH channel, which can eliminate the unfairness caused by codeword allocation in the TD-SCDMA system, and thus is used on the E-HICH channel.
  • the use of UE signature codes is uniformized, so that the average detection performance of different UEs detecting their signatures on the E-HICH channel tends to be fair, and the average false detection rate of each UE to the feedback information sent thereto is reduced.
  • the present invention provides a feature code allocation method for an E-HICH channel, including:
  • the logical feature code number r is respectively converted into a physical feature code number r' that changes with time using a random permutation function ;
  • the feature codes corresponding to the physical feature code number r' are respectively allocated to the UEs.
  • the random permutation function is known to both the NodeB and each UE, by curing the used random permutation function in the NodeB and each UE, or the NodeB notifies each UE by using the random permutation function used by the NodeB. The way to achieve it.
  • the present invention adopts the above technical solution, and has the beneficial effect that when the E-HICH feature code is allocated, the feature code of each UE used on the E-HICH channel is made in a pseudo-random manner with time. The change occurs, the uniformity of the UE feature code is achieved, and the average false detection rate of the feedback information sent by the UE is reduced, thereby avoiding the HSUPA transmission performance of some UEs, and the transmission performance of other UEs is poor. Unfairness, that is, making different UEs The average detection performance of the signature on the E-HICH channel tends to be fair; and the method of the present invention improves user satisfaction and indirectly increases the capacity of the TD-SCDMA system. BRIEF abstract
  • Figure 1 is a schematic diagram of the process of HSUPA in a TD-SCDMA system
  • FIG. 2 is a flow chart showing the allocation of a feature code of an E-HICH channel according to the present invention.
  • FIG. 3 is an exemplary schematic diagram of a shift register when generating a random number according to an embodiment of the present invention.
  • the present invention is directed to the problem of existing protocol E-HICH signature allocation.
  • the random permutation transform process is added, so that the feature codes of each UE used on the E-HICH channel follow a pseudo-random manner.
  • the time changes, so that the average detection performance of each UE detecting its E-HICH channel feature code tends to be fair.
  • FIG. 2 is a flow chart showing the process of allocating the feature codes of the E-HICH channel according to the present invention, and the implementation steps are as follows:
  • the feature code number is assigned to each UE according to the method in the existing protocol.
  • the feature code number obtained by the prior art is referred to as a logical feature code number r;
  • a logical permutation function is respectively converted into a physical characteristic code number r' that changes with time using a random permutation function, and thus the physical characteristics after conversion in the present invention
  • the code number r' can be expressed by the following formula:
  • SFN' represents the subframe number in which the E-HICH is located
  • P represents a random replacement function agreed by the UE and the NodeB. The selection of the random permutation function should ensure that the transformed signature is more uniform over time as possible.
  • the feature codes corresponding to the physical feature code number r' can be respectively allocated to the UEs.
  • the method for allocating the E-HICH channel feature code in the present invention is applicable to the HSUPA in the scheduling mode, and is also applicable to the HSUPA in the non-scheduling mode.
  • the specific implementation manner is as follows:
  • the physical feature code number of the UE is calculated, so the feature code of the UE is C 8 ( , .
  • the physical feature number of the UE is calculated.
  • the random permutation function P should be known to the NodeB and each UE in the cell, because in the present invention, the random permutation function P used is solidified in the NodeB and each UE, or The NodeB is implemented by signaling the random permutation function used to notify each UE. Therefore, for all UEs in the same cell, the random transformation relationship is the same for both the NodeB and the UE, and each UE can accurately know The signature assigned to yourself.
  • the random permutation function P can be implemented in various forms, and several possible embodiments are listed below:
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • a Generate a random number k with a value ranging from 0 to M-i.
  • the method of generating a random number must be known to the NodeB and the UE, which can be generated by using the system subframe number SFN' as a seed;
  • step a there are many methods for generating a random number, but the generated random number must be known to both the transmitting and receiving parties, and there are many specific methods, as shown in FIG. 3, which is a method using a shift register.
  • the specific steps are: I.
  • the length of the shift register is N, and the shift register is initialized with N bits of the system subframe number SFN';
  • step (I) there are many kinds of shift registers.
  • the longer the shift register the longer the period of the obtained pseudo-random sequence, but the larger the calculation amount.
  • the shift register is usually represented by its generator polynomial.
  • the generator polynomial is 1 + ⁇ 3 + ⁇ 7 .
  • the principle of the shift register refer to the related literature.
  • a basic midamble code, a scrambling code, or the like may be used for any of the NodeB and the UE.
  • the known code is combined with SFN' to perform an operation of N bits to initialize the shift register.
  • Embodiment 2 The specific steps of the random replacement function are as follows:
  • the specific setting of the initial random permutation sequence in this embodiment is not limited thereto, and may be selected according to a specific application situation, such as according to the number of UEs in one cell.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Description

E-HICH信道的特征码分配方法 技术领域
本发明涉及一种无线通信系统中的特征码分配方法, 尤其涉及一种在 TD-SCDMA系统中用于发送对 E-DCH信道的反馈信息的 E-HICH信道中特征 码的分配方法。 背景技术
在 3GPP Release 7版本中,对于 1.28Mcps的选项(即 TD-SCDMA系统), 引入了高速上行分组接入 (High Speed Uplink Packet Access, HSUPA) 技术, 该技术的主要特征是引入增强的上行专用传输信道 (Enhanced Dedicated Channel, E-DCH) 及若干相关的物理信道, 并采用快速 Node-B调度、 混合自 动重传请求 (Hybrid Automatic Repetition Request, HARQ ) 等技术, 使得上行 链路的容量得以大大提高。
根据 UE发送上行业务时采用预先分配好还是临时调度的方式, HSUPA可 分为两种方式: 第一种方式为调度方式, 在这种方式中 UE每次在 E-DCH信道 上发送上行数据时, 是根据 NodeB (基站)在 E-AGCH信道上的指示在相应的 物理信道上进行发送的; 另一种方式为非调度方式, 在这种方式中 NodeB在给 UE分配 E-DCH信道时, 也给 UE分配了固定的物理信道, 因此 UE不需要监 听 E-AGCH信道。
在 TD-SCDMA系统中, HSUPA涉及到的下行物理信道包括 E-DCH绝对 资源分配信道(E-DCH Absolute Grant Channel, E-AGCH)和 E-DCH HARQ指 示符信道 (E-DCH HARQ Indicator Channel, E-HICH) ; 涉及到的上行物理信 道包括 E-DCH上行物理信道 (E-DCH Physical Uplink Channel, E-PUCH) , E-DCH上行控制信道 (E-DCH Uplink Control Channel, E-UCCH) 禾卩 E-DCH 上行随机接入控制信道 (E-DCH Random Access Uplink Control Channel , E-RUCCH) 。 其中, E-AGCH用于 NodeB 发送调度信令, 调度信令包含 UE 标识, 物理信道参数等参数, 对于调度方式, 所述 E-AGCH还发送对 E-PUCH 信道的功率控制和同步控制指令; E-HICH用于发送对 E-DCH信道的反馈信息, 对于非调度用户, 所述 E-HICH还用该信道发送上行功率控制 (TPC ) 和上行 同步控制 (SS ) 等命令; E-UCCH用于发送与上行 E-DCH传输相关的信令; E-PUCH用于发送 E-DCH和 E-UCCH的数据; E-RUCCH用于 UE向网络侧请 求物理资源。
如图 1所示, 对于调度方式, HSUPA过程包括以下步骤:
1、 NodeB在 E-AGCH上发送 UE的标识和相关的物理信道参数;
2、 UE如果在 E-AGCH信道上监听到分配给自己的物理资源, 经过适当的 延时后 (具体的延时由协议规定) , 在相应的物理资源上发送 E-DCH 数据和 相关的上行控制信息 (E-UCCH ) ;
3、 NodeB收到 E-DCH数据后, 根据是否正确接收, 经过适当延时后, 在
E-HICH 信道上, 使用相应的特征码发送反馈信息, 反馈信息包括确认 ( Acknowledgement, ACK ) 或非确认 ( Negative Acknowledgement, NAK ) , 当 NodeB正确收到 E-DCH数据时发送 ACK, 否则发送 NAK。
而非调度方式与调度方式有所不同, 主要区别在于: 在非调度方式中, UE 用于发送 E-DCH数据的物理信道是由 NodeB预先分配好的, 因此不需要监听 E-AGCH信道; 另外, NodeB在 E-HICH上除了需要反馈 ACK/NAK信息外, 还需要反馈对 E-PUCH信道的功率控制和同步控制指令。
在上述 HSUPA过程中, E-HICH上传输了 NodeB对多个 UE的反馈信息, 对于不同 UE的反馈信息使用不同的"特征码(signature sequence ) "进行扩频, 由于特征码的选取是与分配给该 UE 的用于传输 E-DCH 数据的物理信道 ( E-PUCH )参数一一对应的, 因此各 UE可根据分配给自己的物理信道知道自 己的特征码, 从而在 E-HICH信道上检测出自己发送给自己的反馈信息。
特征码取自于一个大小为 80x80的正交矩阵 C8Q, 矩阵的第 k行为第 k个 特征码, 因此, 每个特征码的长度为 80比特, 特征码的序号等于其在矩阵 C8() 中对应的行号。 C8o由两个哈达玛 (Hadamard ) 矩阵的张量积 (tensor product, 也称为 Kronecker积) 构成, 即 CS。= C2。® C4, 其中 ®表示张量积, C2Q为大小为 20x20的哈达玛矩阵, C4为大小为 4x4的哈达玛矩阵。
对于调度方式, NodeB在 E-HICH信道上发送对 UE发送的 E-DCH数据的 反馈信息 ACK/NAK, 编码后的反馈信息为 1 比特, NodeB对 UE的反馈信息 用该 UE对应的特征码 C8( 扩频后, 进行 QPSK调制, 再经过扩频码扩频后, 将各个 UE的反馈信息叠加后发送出去。 其中, C8( 表示第 r个特征码, r由以 下公式确定:
r = \ 6(t0 - \) + (q0 - \ )^- 其中, tQ为分配给该 UE用于传输 E-DCH数据的第一个 (编号最低的) 时 隙号, 其取值范围为 1, 2, ..., 5; QQ为在时隙 tQ分配给该 UE用于传输 E-DCH 数据使用的扩频因子, 其取值范围为 1, 2, 4, 8, 16; qQ为分配的码道号, 取 值范围为 1, 2, ..., Qoo
对于非调度方式, NodeB在 E-HICH信道上不仅发送对 UE发送的 E-DCH 数据的反馈信息 ACK/NAK, 还反馈对 E-DCH信道的功率控制 (TPC) 和同步 控制信息 (SS ) 。 这时候, 80个特征码被等分成 20组, 每组由 4个特征码组 成。 且每组中的第一个特征码用于反馈信息 ACK/NAK的扩频, 其余三个特征 码及其补码共 6个码构成用于表示 TPC/SS的 6种状态, 每个状态可以用 1 比 特标识。 NodeB对 UE的反馈信息和 TPC/SS指令用相应的特征码扩频后, 进 行 QPSK调制, 再经过扩频码扩频后, 将各个 UE的反馈信息叠加后发送出去。 对于非调度方式, UE 的特征码分配是由高层信令告知的, 而不是采用固定的 公式计算得到。
从 E-HICH信道特征码分配的方法可以看出,对于调度方式, 当分配给 UE 用于传输 E-DCH 数据的物理信道固定之后, 其特征码便固定下来; 对于非调 度方式的 HSUPA过程,高层信令给 UE分配特征码后,在此次 HSUPA过程中, 其特征码便一直不变。
对特征码的互相关性进行分析发现, 当将两个特征码相差一个比特进行互 相关运算时, 得到的互相关值与这两个码的序号有关, 当序号之差小于等于 8 时, 两个码之间的互相关值较大, 而大于 8时互相关性较小。 这种特性与特征 码的构造方法有关。熟悉通讯知识的人都知道,两个信号之间的互相关性越大, 则越难检测出这两个信号。 这是因为无线信道通常是多径信道, 即接收端收到 的信号为发送端发送的信号经过不同延时的叠加, 这导致了接收信号存在符号 间干扰 (Inter Symbol Interference, ISI) , 接收端在进行信号检测之前, 通常 需要使用均衡器对接收信号进行均衡, 以减小 ISI, 从而提高检测性能, 然而, 实际的均衡器的延时是有限, 对接收信号进行均衡后, 不可能完全消除 ISI。 这时, 如果两个信号的互相关性能不好, 则导致各 UE的接收端的对发送给它 的反馈信息的误检测率较高。
在 HSUPA过程中, 如果 UE使用的特征码一直不变, 则意味着各个特征 码之间的互相关特性保持不变, 这样, 将导致互相关性能好的码字使得 UE对 发送给它的反馈信息的误检测率低, 而互相关性较差的码字使得 UE对发送给 它的反馈信息的误检测率较高, 从而造成了某些 UE的 HSUPA传输性能好, 而另外一些 UE的传输性能差的不公平现象。 发明内容
本发明要解决的技术问题是提供一种 E-HICH信道的特征码分配方法, 可 消除 TD-SCDMA系统中由于码字分配的所带来的不公平现象,使得在 E-HICH 信道上使用的 UE特征码的使用均匀化, 从而使得不同 UE在 E-HICH信道上 检测其特征码的平均检测性能趋于公平化, 降低各个 UE对发送给它的反馈信 息的平均误检率。
为解决上述技术问题, 本发明提供一种 E-HICH信道的特征码分配方法, 包括:
首先, 为各个 UE分配逻辑特征码序号 r;
然后, 使用随机置换函数将所述逻辑特征码序号 r分别转换成随时间变化 的物理特征码序号 r' ;
之后, 将所述物理特征码序号 r'所对应的特征码分别分配给各 UE。
并且, 所述随机置换函数对于 NodeB和各 UE都是已知的, 通过将所使用 的随机置换函数固化在 NodeB和各 UE中,或者由 NodeB将所使用的随机置换 函数通过信令告知各个 UE的方式来实现。
本发明由于采用了上述技术方案, 具有这样的有益效果, 即在 E-HICH特 征码进行分配时, 通过使得 E-HICH信道上使用的各 UE的特征码按照一种伪 随机的方式随着时间发生变化, 实现了 UE特征码使用的均匀化, 降低了 UE 对于发送给它的反馈信息的平均误检率, 从而避免了某些 UE的 HSUPA传输 性能好, 而另外一些 UE 的传输性能差的不公平现象, 即使得不同的 UE 在 E-HICH 信道上检测其特征码的平均检测性能趋于公平化; 并且本发明所述方 法提高了用户的满意度, 并间接提高了 TD-SCDMA系统的容量。 附图概述
本发明的特征、 性能由以下的实施例及其附图进一步描述。
图 1为 TD-SCDMA系统中 HSUPA的过程示意图;
图 2为根据本发明对 E-HICH信道的特征码进行分配的流程框图; 图 3为根据本发明实施例一生成随机数时移位寄存器的示例性原理图。 本发明的最佳实施方式
本发明针对现有协议 E-HICH特征码分配的问题, 在现有协议的基础上, 增加随机置换变换过程, 使得 E-HICH信道上使用的各 UE的特征码按照一种 伪随机的方式随着时间发生变化, 从而使得各个 UE检测其 E-HICH信道特征 码的平均检测性能趋于公平。
如图 2所示为根据本发明对 E-HICH信道的特征码进行分配的流程框图, 其实现步骤如下:
首先, 根据现有协议中的方法分别为各个 UE分配特征码序号, 在本发明 中, 将该通过现有技术分配所得的特征码序号称为逻辑特征码序号 r;
然后, 为了使检测性能趋于公平, 因此使用一个随机置换函数, 将所述逻 辑特征码序号分别转换成随时间变化的物理特征码序号 r', 因此在本发明中转 换后的所述物理特征码序号 r'可用如下公式表示:
r' =Ρ ( ΐ, SFN' )
其中, SFN'表示所述 E-HICH所在的子帧号, P表示一种由 UE和 NodeB 约定好的随机置换函数。 所述随机置换函数的选取应确保经过转换的特征码随 时间的变化越均匀越好。
之后就可以将所述物理特征码序号 r'所对应的特征码分别分配给各 UE了。 本发明所述分配 E-HICH信道特征码的方法,即适用于调度方式的 HSUPA, 也适用于非调度方式的 HSUPA,具体实现方式如下:
对于调度方式, 本发明中, NodeB和 UE计算特征码序号的方法如下: 首先, 根据协议中规定的公式: r = 16(t0 -l) + ( 0 -l)^ 计算出该 UE的逻辑特征码序号;
然后, 采用如下公式
r' =Ρ ( ΐ, SFN' )
计算出该 UE的物理特征码序号, 因此该 UE的特征码为 C8( ,。
对于非调度方式, UE的逻辑特征码序号 r由 NodeB分配, 然后采用公式: r' =Ρ ( ΐ, SFN' )
计算得到该 UE的物理特征序号。
在本发明中,所述随机置换函数 P对于 NodeB和小区中的各个 UE应该都 是已知的,因为在本发明中通过将所使用的随机置换函数 P固化在 NodeB和各 UE中, 或者由 NodeB通过信令将所使用的随机置换函数告知各个 UE的方式 来实现; 因此对同一小区的所有 UE 而言, 这种随机变换关系对于 NodeB 和 UE都是一样的, 各个 UE都能准确地知道分配给自己的特征码。
在本发明的所述实现方法中,随机置换函数 P可以采用有多种形式来实现, 以下列举为几种可行的实施例:
实施例一:
在该实施例中随机置换函数的具体步骤如下:
( 1 ) 对置换序列进行初始化, 主要是指设置所述置换序列的长度 M=80, 并初始化所述置换序列 P,其中 P(0)=0,P(1)=1, ...,P(M-1)=M-1 ;然后,设置 i=0;
(2 ) 计算得到一个与 SFN'有关的置换序列 P, 在本实施例中其具体实现 步骤如下:
循环执行下面的步骤 a到(, 直到 i=M-2;
a、 产生取值范围为 0〜M-i 的随机数 k, 生成随机数的方法对 NodeB 和 UE必须是已知的, 这可以使用系统子帧号 SFN'作为种子来产生;
b、 置换 P(i)与 P(k+i), 即 tmp=P(i),P(i)=P(k+i),P(k+i)=tmp;
c、 将 i加 1。
在上述步骤 a中, 生成随机数的方法有很多, 但生成的随机数必须是收发 双方都是已知的, 具体的方法有很多, 如图 3所示为一种利用移位寄存器的方 法, 其具体步骤为: I、 取移位寄存器的长度为 N, 用系统子帧号 SFN'的 N比特初始化该移位 寄存器;
II、 选取 p, 使之满足 15;
III、 对移位寄存器连续移位 s次, 其中 s p, 优选的, 可以选取 s=3N, 得到输出序列 x, 设置 k=x的低 p位;
IV、 如果 k>M-i, 则设置 k=k-(M-i;)。
其中, 在步骤 (I)中, 移位寄存器的选取有很多种, 一般而言, 移位寄存器 越长, 得到的伪随机序列的周期也越长, 但是计算量也越大。 移位寄存器通常 用其生成多项式来表示, 比如, 对于图 3所示的移位寄存器, 其生成多项式为 1 + χ37, 关于移位寄存器的原理可以参见相关文献。
在步骤 (I)中, 在初始化移位寄存器时, 除了使用上述方法外, 还可以使用 小区基本中置扰码 (Basic midamble code), 小区扰码 (Scrambling code)等任何对 NodeB和 UE都已知的码与 SFN'相组合进行运算得到的 N比特来初始化移位 寄存器。
实施例二: 随机置换函数具体步骤如下:
(1) 收发双方约定好一个长度为 M=80 的初始置换序列 Q(0), Q(l)..., Q(M-l);
(2) 对于任意 0 r<M, 设置 P(r, SFN,)=Q((r+SFN,)mod 80), 这样, 在 序列 Q的基础上, 得到一个随时间变化的置换序列。
作为一个例子, 初始随机置换序列可以设置为 Q={1, 41, 21, 61, 11,
51, 31, 71, 6, 46, 26, 66, 16, 56, 36, 76, 4, 44, 24, 64, 14, 54, 34, 74, 9, 49, 29, 69, 19, 59, 39, 79, 3, 43, 23, 63, 13, 53, 33, 73, 8, 48, 28, 68, 18, 58, 38, 78, 5, 45, 25, 65, 15, 55, 35, 75, 10, 50, 30, 70, 20, 60, 40, 80, 2, 42, 22, 62, 12, 52, 32, 12, 7, 47, 21, 67, 17, 57, 37, 11} , 当然在本实施例中初始随机置换序列的具体设置并不局限 于此, 可以根据具体应用情况, 如根据一个小区中 UE数量来进行选择。
实施例三, 随机置换函数具体步骤如下:
对于任意 0 r<M, 设置 P(r, SFN')=(r+SFN')mod 80, 这样, 得到一个随 时间变化的置换序列。

Claims

权 利 要 求
1、 一种 E-HICH信道的特征码分配方法, 包括:
首先, 为各个 UE分配逻辑特征码序号 r;
其特征在于, 该方法还包括:
然后, 使用随机置换函数将所述逻辑特征码序号 r分别转换成随时间变化 的物理特征码序号 r' ;
之后, 将所述物理特征码序号 r'所对应的特征码分别分配给各 UE。
2、 根据权利要求 1所述的 E-HICH信道的特征码分配方法, 其特征在于, 所述随机置换函数对于 NodeB和各 UE都是已知的, 通过将随机置换函数固化 在 NodeB和各 UE中,或者由 NodeB将所使用的随机置换函数通过信令告知各 个 UE的方式来实现。
3、 根据权利要求 2所述的 E-HICH信道的特征码分配方法, 其特征在于, 所述随机置换函数用如下公式表示: r' =P (r, SFN ' ) , 其中 SFN'表示所述 E-HICH所在的系统子帧号, P表示随机置换函数。
4、 根据权利要求 3所述的 E-HICH信道的特征码分配方法, 其特征在于, 所述随机置换函数通过以下方法来实现:
( 1 ) 将置换序列进行初始化;
( 2 ) 计算得到一个与系统子帧号 SFN'有关的置换序列 P。
5、 根据权利要求 4所述的 E-HICH信道的特征码分配方法, 其特征在于: 所述步骤 (1 ) 具体是通过如下方法来进行初始化的:
设置所述置换序列的长度 M=80, 并初始化所述置换序列为 P, 其中 P(0)=0,P(1)=1, ...,P(M-1)=M-1 ; 然后, 设置 i=0 ;
而所述步骤 (2 ) 通过如下方法来实现:
即循环执行步骤 a到 c, 直到 i=M-2,
a、 使用系统子帧号 SFN'作为种子产生取值范围为 0〜M-i的随机数 k; b、 置换 P(i)与 P(k+i) ;
c、 将 i加 1。
6、 根据权利要求 5所述的 E-HICH信道的特征码分配方法, 其特征在于, 利用移位寄存器来生成所述随机数 k, 包括如下步骤: I、 取所述移位寄存器的长度为 N, 并初始化该移位寄存器;
II、 选取 p, 使之满足 15;
III、 对所述移位寄存器连续移位 s次, 其中 s p, 得到输出序列 x, 设置 k=x的低 p位;
IV、 如果 k>M-i, 则设置 k=k-(M-i;)。
7、 根据权利要求 6所述的 E-HICH信道的特征码分配方法, 其特征在于: 使用系统子帧号 SFN'的 N比特来初始化所述移位寄存器; 或者, 使用小区基本中置扰码或小区扰码与 SFN'相组合进行运算后得到的 N比 特数据来初始化所述移位寄存器。
8、 根据权利要求 3所述的 E-HICH信道的特征码分配方法, 其特征在于, 所述随机置换函数通过如下步骤来实现:
( 1 ) 收发双方约定好一个长度为 M=80 的初始置换序列 Q(0), Q(l)... , Q(M-l);
(2 ) 对于任意 0 r<M, 设置 P(r, SFN,)=Q((r+SFN,)mod 80)。
9、 根据权利要求 3所述的 E-HICH信道的特征码分配方法, 其特征在于, 所述随机置换函数通过如下步骤来实现: 对于任意 0 r<M, 设置 P(r, SFN')=(r+SFN')mod 80。
PCT/CN2008/070790 2007-04-24 2008-04-24 Signature sequence distributing method on e-hich channel Ceased WO2008128481A1 (en)

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