CN100466488C - 一种自适应调整高速共享控制信道功率的方法 - Google Patents

一种自适应调整高速共享控制信道功率的方法 Download PDF

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CN100466488C
CN100466488C CNB2005101054724A CN200510105472A CN100466488C CN 100466488 C CN100466488 C CN 100466488C CN B2005101054724 A CNB2005101054724 A CN B2005101054724A CN 200510105472 A CN200510105472 A CN 200510105472A CN 100466488 C CN100466488 C CN 100466488C
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power
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CN1852041A (zh
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郭房富
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XFusion Digital Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

本发明公开了一种自适应调整HS-SCCH功率的方法。包括A、移动用户HSDPA链路变化时，设置HS-SCCH信道发射功率相对于下行专用物理控制信道(DPCCH)导频域功率的功率偏置Poffset；B、获取所述移动用户下行DPCCH信道上的导频功率PDPCCH，Pilot，并设置该移动用户HS-SCCH的初始发射功率：PHS-SCCH，Init＝PDPCCH，Pilot+Poffset；C、根据HS-DPCCH反馈的ACK/NACK/DTX信息设置第N次调度该移动用户时的HS-SCCH信道功率的调整量；D、将所述的HS-SCCH信道功率的调整量加入至HS-SCCH的发射功率，获取第N次调度该移动用户时的HS-SCCH的发射功率。本发明设置的HS-SCCH初始发射功率能够比较接近实际的HS-SCCH性能需求。

Description

一种自适应调整高速共享控制信道功率的方法
技术领域
本发明涉及通信领域，尤其涉及一种自适应调整高速共享控制信道(HS-SCCH)功率的方法。
背景技术
高速下行分组接入(HSDPA)，是一种在宽带码分多址(WCDMA)系统的下行链路上进行高速数据传输的技术。HSDPA的引入增加了三种物理信道，分别是在下行链路传输数据信息的高速物理下行共享信道(HS-PDSCH)、传输下行控制信息的高速共享控制信道(HS-SCCH)，以及传输上行反馈信息的高速专用物理控制信道(HS-DPCCH)。
上述信道中，HS-SCCH信道中传输的信息是为正确接收HS-PDSCH信道中的数据服务的，也就是说，如果用户设备(UE)要正确接收下行HS-PDSCH信道上的数据，必须首先正确接收到HS-SCCH信道上的信息。所以，必须为HS-SCCH信道分配足够的功率资源。而另一方面，在小区下行功率资源一定的情况下，如果给HS-SCCH分配的功率过多，那么分配给HS-PDSCH信道上的功率就会减少，从而小区吞吐率就会降低。
在实际系统中，UE所处的无线环境是千变万化的，导致对HS-SCCH的功率需求也相差很大，因此，如何控制HS-SCCH信道的功率就成为提高小区功率资源利用率的一个关键因素。
HS-DPCCH信道上承载的信息包括:UE是否已经正确接收到了下行HS-PDSCH信道上的数据的确认或非确认信息(ACK/NACK)，以及UE通过测量公共导频信道(CPICH)信道上的信噪比(SNR)计算得到的信道质量指示(CQI)(该CQI直接反映了UE所处环境的信道质量的变化)。HS-DPCCH物理信道的帧结构如图1所示。
上行HS-DPCCH物理信道与下行HS-PDSCH物理信道的时序关系如图2所示。
也就是说，当UE收到HS-PDSCH信道之后的19200chips左右时间，在HS-DPCCH物理信道上反馈ACK/NACK信息。
每一条HSDPA无线链路都有一条伴随的专用信道(DCH)链路，用于传输高层的信令。其中下行专用物理信道(DPCH)物理信道的帧结构如图3所示。其中Data1/Data2表示数据域，发射功率控制(TPC)域用于承载TPC命令字，传输格式组合指示(TFCI)域用于承载传输格式组合指示，Pilot域为导频比特，N代表各个域所包含的比特个数。
现有技术中，存在两种HS-SCCH功率控制方法。
第一种HS-SCCH功率控制方法是固定HS-SCCH的发射功率，即不对HS-SCCH进行功率控制。HS-SCCH功率的设置需要满足HS-SCCH信道的覆盖要求。
由于不对HS-SCCH进行功率控制，那么HS-SCCH的功率设置就必须按照覆盖范围内最差的信道环境下所需要的功率来设置，会有较大的功率浪费。例如，在小区边缘，HS-SCCH的发射功率必须要达到1W以上才能使HS-SCCH被UE正确接收，而在靠近小区中心的地方也许只要0.1W的功率就可以了，这个时候如果发射1W的功率，另外的0.9W就是多余的。
第二种HS-SCCH功率控制方法是设置一个固定的HS-SCCH相对于下行DPCCH导频域的功率偏置，HS-SCCH的功率随着下行DPCCH导频域的功率变化而变化。在软切换期间，由于UE会对不同的下行无线链路的接收信号进行合并处理，因此，此时的下行功率控制已经不能反映单条无线链路的信号质量的变化了，应该适当增加HS-SCCH的功率偏置，尤其对于HS-SCCH搭载较差链路(路损较大链路)情况更应如此。
但第二种方案需要区分用户是否处于软切换状态；同时在软切换状态下HS-DSCH伴随的DPCH信道的功率控制不能真实的反映该HS-DSCH服务链路的质量的变化，从而严重影响HS-SCCH的功率控制性能。
发明内容
本发明提供一种自适应调整HS-SCCH功率的方法，以尽可能少的HS-SCCH功率满足HS-SCCH的解调性能要求；同时，能够根据信道条件的变化自适应的调整HS-SCCH的发射功率，并把HS-SCCH的误帧率控制在目标范围之内。
本发明方法包括:
一种自适应调整高速共享控制信道功率HS-SCCH的方法，包括以下步骤:
A、移动用户高速下行分组接入HSDPA链路变化时，设置HS-SCCH信道发射功率相对于下行专用物理控制信道DPCCH导频域功率的功率偏置Poffset；
B、获取所述移动用户下行DPCCH信道上的导频功率PDPCCH，Pilot，并设置该移动用户HS-SCCH的初始发射功率:
PHS-SCCH，Init＝PDPCCH，Pilot+Poffset；
C、根据高速专用物理控制信道HS-DPCCH反馈的ACK/NACK/DTX信息设置第N次调度该移动用户时的HS-SCCH信道功率的调整量ΔHS-SCCHPower，(n+1)为: Δ HS - SCCHPower , ( n + 1 ) = Δ HS - SCCHPower , n + ( N DTX FER T × N s - 1 ) × S p , 其中n≥1，ΔHS-SCCHPower，1＝0，Sp为DTX个数等于零时HS-SCCH功率的向下调整步长，NDTX为Ns个移动用户的ACK/NACK/DTX反馈信息中DTX的个数，FERT是HS-SCCH功率控制的目标误帧率FER；
D、获取第N次调度该移动用户时的HS-SCCH的发射功率PHS-SCCH，n为:
PHS-SCCH，n＝PHS-SCCH，Init+CQIInit-CQIn+ΔHS-SCCHPower，n，其中CQIInit为初始调度该移动用户时，该移动用户报告的信道质量指示CQI值，CQIn为第N次调度该移动用户时，该移动用户反馈的CQI值。
所述的步骤A中，所述的功率偏置Poffset通过仿真获得。
所述的步骤B中，所述的导频功率PDPCCH，Pilot由NodeB测量获得。
所述的步骤B中，所述的导频功率PDPCCH，Pilot是NodeB在HSDPA链路变化后第一次调度该移动用户时的测量值。
所述的步骤B中，该移动用户HS-SCCH的初始发射功率PHS-SCCH，Init是在HSDPA链路变化后第一次调度该移动用户时的HS-SCCH的发射功率。
所述的步骤D中，还包括设定一个向上调整的最大步长Smax，u，每次功率的向上调整量都必须小于等于向上调整的最大步长Smax，u。
所述的每次功率的向上调整量都必须小于向上调整的最大步长Smax，u，满足如下公式:
( N DTX FER T × N s - 1 ) × S p ≤ S max , u
所述的向上调整的最大步长Smax，u通过仿真获得。
所述的HSDPA链路变化，包括移动用户建立或者重配HSDPA链路。
发明有益效果如下:
本发明设置的HS-SCCH初始发射功率能够比较接近实际的HS-SCCH性能需求，从而提高了根据ACK/NACK/DTX来调整HS-SCCH发射功率的收敛速度。
本发明方案与环境无关，能适用于各种无线环境。根据CQI的变化来调整HS-SCCH，不区分软切换和非软切换场景。
附图说明
图1为HS-DPCCH物理信道的帧结构示意图；
图2为上行HS-DPCCH物理信道与下行HS-PDSCH物理信道的时序关系示意图；
图3为下行DPCH物理信道的帧结构示意图；
图4为本发明的流程示意图。
具体实施方式
下面结合说明书附图来说明本发明具体实施方式。
如图4所示，是本发明的流程示意图，从图中可见，本发明方案主要包括以下步骤:
S1、移动用户HSDPA链路发生变化的时候，为该移动用户配置一个HS-SCCH信道与下行DPCCH导频功率偏置Poffset。
本方案中，HSDPA链路发生变化可以指的是移动用户建立HSDPA链路，或者是移动用户重配HSDPA链路等。
该功率偏置与下行DPCH的扩频因子有关，是一个经验值，可以通过仿真得到，可以与现有技术2中非软切换区域的功率偏置一致。
S2、当NodeB在HSDPA链路建立或重配后第一次调度某个用户的时候，读取此时该用户下行的DPCCH信道上的导频功率PDPCCH，Pilot。
本步骤采用在HSDPA链路建立或重配后第一次调度某个移动用户的时候，读取此时该移动用户下行的DPCCH信道上的导频功率PDPCCH，Pilot。
该导频功率PDPCCH，Pilot可以由NodeB每2ms测量下行DPCCH信道导频域的码片功率获得。该测量间隔可以根据系统要求而定，不一定局限于上述2ms。
S3、设置HSDPA链路建立或重配后第一次调度该移动用户时的HS-SCCH的发射功率:PHS-SCCH，Init＝PDPCCH，Pilot+Poffset。
在HSDPA链路建立或重配后第一次调度该移动用户时，根据步骤S1和S2中所得到的Poffset和PDPCCH，pilot，计算得出HS-SCCH的发射功率。
S4、记录第一次调度该移动用户时，移动用户报告的CQI值CQIInit。
本步骤根据移动用户在第一次被调度之前上报的最新的CQI值，得到初始值CQIInit。
该CQI值CQIInit值是由移动用户通过HS-DPCCH信道上报的，在3GPPTS25.214协议中有CQI的定义:
在不受限制的观测时间内，UE上报一个最高的CQI值，该值满足:UE能够在3个时隙的参考时间内接收以与上报CQI值或者较低CQI值对应的传输块大小、HS-PDSCH码数和调制方式形成的单个HS-DSCH子帧，且传输块错误概率不超过0.1。这里CQI测量的参考时间结束于传输CQI值子帧的第1个时隙的I个时隙以前。
S5、计算该移动用户HS-SCCH信道的功率调整值，使用如下公式:
Δ HS - SCCHPower , ( n + 1 ) = Δ HS - SCCHPower , n + ( N DTX FER T × N s - 1 ) × S p ;
其中n≥I，ΔHS-SCCHPower，1＝0，SP为DTX个数等于零时HS-SCCH功率的向下调整步长，NDTX为Ns个移动用户的ACK/NACK/DTX反馈信息中DTX的个数。
上述公式中，Ns是一个参数，表明基站每给某个移动用户调度Ns次之后，需要调整一次HS-SCCH的功率。在这Ns次调度中，统计在应该收到移动用户响应的时刻所收到的DTX的个数，对应的收到的DTX的个数记为NDTX。例如，Ns可以取为5。
上述公式中，FERT是HS-SCCH功率控制的目标误帧率(FER Frame ErrorRate)，是输入参数，通常设为1％。Sp也是输入参数，可以通过仿真来优化，例如取值为0.005dB。
同时考虑到该方法的鲁棒性，每次调整的功率不能太大，每次功率的向上调整量都必须小于等于向上调整的最大步长，也即是满足如下公式:
( N DTX FER T × N s - 1 ) × S p ≤ S max , u
这里Smax，u也是输入参数，可以通过仿真优化，例如取值为0.4dB。
该NDTX是按照如下方式获得:
NodeB根据HS-DPCCH物理信道和HS-PDSCH物理信道之间的时序关系，在每个该收到ACK/NACK反馈的时刻统计ACK/NACK/DTX信息。每收到Ns个该移动用户的ACK/NACK/DTX反馈信息中DTX的个数为NDTX，计算HS-SCCH发射功率的功率调整量。
NodeB给某个移动用户调度了数据之后，能够确定什么时候应该收到ACK/NACK响应，如果没有收到，则记录为收到一次DTX，在Ns个移动用户反馈信息中统计DTX的个数。
S6、设置第N次调度该移动用户时的HS-SCCH的发射功率:
PHS-SCCH，n＝PHS-SCCH，Init+CQIInit-CQIn+ΔHS-SCCHPower，n；
其中CQIInit为初始调度该移动用户时，该移动用户报告的CQI值，CQIn为第N次调度该移动用户时，该移动用户反馈的最新的CQI值。
本发明实施例中，各参数的取值是根据网络情况而定，在实际情况下，可能有所变化，但上述变化不会影响本发明方案的实施。
本发明设置的HS-SCCH初始发射功率能够比较接近实际的HS-SCCH性能需求，从而提高了根据ACK/NACK/DTX来调整HS-SCCH发射功率的收敛速度。该方案与环境无关，能适用于各种无线环境。根据CQI的变化来调整HS-SCCH，不区分软切换和非软切换场景。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (9)

1、一种自适应调整高速共享控制信道功率HS-SCCH的方法，其特征在于，包括以下步骤:
A、移动用户高速下行分组接入HSDPA链路变化时，设置HS-SCCH信道发射功率相对于下行专用物理控制信道DPCCH导频域功率的功率偏置Poffset；
B、获取所述移动用户下行DPCCH信道上的导频功率PDPCCH，Pilot，并设置该移动用户HS-SCCH的初始发射功率:
PHS-SCCH，Init＝PDPCCH，Pilot+Poffset；
C、根据高速专用物理控制信道HS-DPCCH反馈的ACK/NACK/DTX信息设置第N次调度该移动用户时的HS-SCCH信道功率的调整量ΔHS-SCCHPower，(n+1)为: Δ HS - SCCHPower , ( n + 1 ) = Δ HS - SCCHPower , n + ( N DTX FER T × N s - 1 ) × S p , 其中n≥1，ΔHS-SCCHPower，1＝0，Sp为DTX个数等于零时HS-SCCH功率的向下调整步长，NDTX为Ns个移动用户的ACK/NACK/DTX反馈信息中DTX的个数，FERT是HS-SCCH功率控制的目标误帧率FER；
D、获取第N次调度该移动用户时的HS-SCCH的发射功率PHS-SCCH，n为:
PHS-SCCH，n＝PHS-SCCH，Init+CQIInit-CQIn+ΔHS-SCCHPower，n，其中CQIInit为初始调度该移动用户时，该移动用户报告的信道质量指示CQI值，CQIn为第N次调度该移动用户时，该移动用户反馈的CQI值。
2、如权利要求1所述的方法，其特征在于，所述的步骤A中，所述的功率偏置Poffset通过仿真获得。
3、如权利要求1所述的方法，其特征在于，所述的步骤B中，所述的导频功率PDPCCH，Pilot由NodeB测量获得。
4、如权利要求1所述的方法，其特征在于，所述的步骤B中，所述的导频功率PDPCCH，Pilot是NodeB在HSDPA链路变化后第一次调度该移动用户时的测量值。
5、如权利要求1或4所述的方法，其特征在于，所述的步骤B中，该移动用户HS-SCCH的初始发射功率PHS-SCCH，Init是在HSDPA链路变化后第一次调度该移动用户时的HS-SCCH的发射功率。
6、如权利要求1所述的方法，其特征在于，所述的步骤D中，还包括设定一个向上调整的最大步长Smax，u，每次功率的向上调整量都必须小于等于向上调整的最大步长Smax，u。
7、如权利要求6所述的方法，其特征在于，所述的每次功率的向上调整量都必须小于向上调整的最大步长Smax，u，满足如下公式:
( N DTX FER T × N s - 1 ) × S p ≤ S max , u .
8、如权利要求6所述的方法，其特征在于，所述的向上调整的最大步长Smax，u通过仿真获得。
9、如权利要求1所述的方法，其特征在于，所述的HSDPA链路变化，包括移动用户建立或者重配HSDPA链路。
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