CN102771076A - 向移动站分发组大小指示 - Google Patents
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Abstract
可以以高级分配MAP传输控制信令的形式将组大小指示从基站分发给移动站。可以使用基于诸如二分之一和四分之一编码率之类的编码率指示组的大小的表来向诸如移动站之类的站发送信令控制信息。可以通过基于使用组中的与用于由所述站进行数据传输的数据资源相邻的未被占用的资源确定大小,来控制浪费。然而,组中的与数据资源不相邻的未被占用的资源没有用于数据传输,因此被浪费了。
Description
背景技术
本发明总体上涉及基站与移动站之间的无线通信。
高级分配MAP(A-A-MAP)用于传输控制信令,诸如资源分配、混合自动重复请求(HARQ)等,以用于从基站到移动站的数据传输。可以通过不同的编码率来对A-A-MAP进行编码。例如,二分之一、四分之一或八分之一编码率可以分别使用不同的A-MAP逻辑资源单元(MLRU)大小。
因此,可以将A-A-MAP分成具有不同MLRU大小的不同的组。例如,组一可以用于二分之一编码率,组二可以用于四分之一编码率,以及组三可以用于八分之一编码率。因此,每个组可以具有由不同的移动站使用的多个MLRU大小,其被称为每个组的组大小。例如,组一的组大小一可以是10个MLRU。
附图说明
图1是一个实施例的架构描述;
图2是根据一个实施例的针对图1所示的实施例的流程图;以及
图3是根据一个实施例的针对非用户特定的A-MAP的时域相对频域的图示。
具体实施方式
参照图1,根据一个实施例,无线系统10可以是正交频分多址(OFDMA)通信系统。基站12可以是在非用户特定的高级映射(A-MAP)信息元素(IE)中将A-A-MAP组大小以信号的形式发送到高级移动站(AMS)21的高级基站(ABS)。之后,高级移动站21可以根据在来自高级基站12的非用户特定的A-MAP IE中接收到的A-A-MAP组大小来盲检测其A-MAP信令。
基站12包括无线收发器14。收发器14耦合到诸如处理器或微控制器之类的控制器16。存储设备18也耦合到控制器。作为一个示例,存储设备可以是半导体存储器。在一些实施例中,存储设备18可以存储指令序列20。
移动站21适于与基站无线地通信。移动站也可以包括耦合到控制器24的收发器22。控制器24继而可以耦合到存储设备26。
一些实施例可能涉及OFDMA无线通信标准IEEE 802.16m。见可从“IEEE,New York,New York 10016”得到的“P 802.16m/D1Advanced AirInterface(Draft 1),July 31,2009”。在该提出的标准中,在跨越系统带宽的多个正交子载波上调制并且发送信息。高级基站12可以在A-A-MAP IE中将诸如资源单元、HARQ等的控制信息以信号的形式发送给高级移动站21,其中A-A-MAP IE是被广播给所有高级移动站的分离的或基于组的编码。
在IEEE 802.16m中,正交相移键控(QPSK)二分之一、四分之一编码率{1/2,1/4}或QPSK{1/2,1/8}被接受作为A-A-MAP调制和编码方案(MCS)集合。基于MCS和A-A-MAP IE大小来将A-A-MAP一起分组。可以在非用户特定的A-MAP IE中指示每个A-A-MAP组的大小,以促进AMS A-A-MAP盲检测。
在一些实施例中,可以使用下面的设计因素来在非用户特定的A-MAPIE中生成A-A-MAP组大小指示表。支持一个A-A-MAP IE大小。给定MCS集合和部分频率复用(FFR)配置,单个表可以用于所有的系统带宽。用于A-A-MAP的MLRU的最大数量是每子帧48个,其最多是20MHz带宽下子帧资源的29.17%[=(48*56/96)/96]。应当指出的是,在20MHz带宽下,每个MLRU具有56个子载波并且LRU的最大数量是96。对于所有的情况,总的A-A-MAP IE的最大数量限于32个。
在一个实施例中,如下面解释的,使用四个A-A-MAP组大小指示表。当在非FFR情况中使用QPSK{1/2,1/4}时,该情况被称为情况1,使用两个A-A-MAP组。每个组中的最少资源单元分别是1个MLRU和2个MLRU(即,[1,2]MLRU)。当在非FFR情况中使用QPSK{1/2,1/8}时,该情况被称为情况2,使用两个A-A-MAP组。每个组中的最少资源单元分别是1个MLRU和4个MLRU(即,[1,4]MLRU)。在情况3中,使用FFR,当针对3个A-A-MAP组的FFR复用使用QPSK{1/2}以及针对1个A-A-MAP组的复用使用QPSK{1/2,1/4}时,使用三个A-A-MAP组。每个组中的最少资源单元分别是1、1和2个MLRU(即,[1,1,2]MLRU)。在情况4中,使用FFR,当针对3个A-A-MAP组的FFR复用使用QPSK{1/2}以及针对1个A-A-MAP组的复用使用QPSK{1/2,1/8}时,使用三个A-A-MAP组。每个组中的最少资源单元分别是1、1和4个MLRU(即,[1,1,4]MLRU)。
在一个实施例中,可以将8比特查找表用于A-A-MAP组大小指示,以使得非用户特定的信令开销在合理的范围内。然而,为了实现该目标,可能移除一些组大小组合。在一些实施例中,在组大小组合移除的过程中可能考虑下面的两个因素。第一个因素是A-A-MAP组中与数据资源相邻的未被占用的资源可以用于由ABS进行数据传输。因此,不存在资源浪费,但是需要额外的盲检测。
参照绘出了时域相对频域的图3,A-A-MAP组1在频域中与数据资源不相邻,而A-A-MAP组2在频域中与数据资源相邻。第二个因素是A-A-MAP组中与数据资源不相邻的未被占用的资源不能用于数据传输,因此被浪费。在一些实施例中,对于系统效率而言,该设计有利地最小化了资源浪费。
在一些实施例中,具有更强鲁棒性MCS的A-A-MAP组可以被放置在具有更弱鲁棒性MCS的A-A-MAP组之前。当可能最小化资源浪费时,可以以信号的形式发送具有更强鲁棒性MCS的组的准确大小。理由如下。由于使用更强鲁棒性MCS的每个IE采用更多的资源,因此对于给出的固定资源,具有更强鲁棒性MCS的最大组大小更小。因此,使用更强鲁棒性MCS以信号的形式发送A-A-MAP组的准确大小占用更少的信令开销。另一方面,更弱鲁棒性MCS的组导致更多的大小组合。如果不使用更弱鲁棒性MCS来以信号的形式发送组的准确大小,则可以移除许多组合。而且,由于更弱鲁棒性的组在更强鲁棒性的组之后并且与数据资源相邻,因此组合移除不会转变成资源浪费。
表1列出了在假设对于5、10(7和8.75MHz)、20MHz的系统带宽而言A-A-MAP的MLRU的总数量分别是12、24和48的情况下,可能组大小组合的数量和用于以信号的形式发送每个组合的比特的数量。对于不受约束的A-A-MAP资源指示,A-A-MAP组大小指示的信令开销可以大至14比特。因此,期望移除一些组合,以便减小A-A-MAP资源指示的信令开销。
表1不受约束的A-A-MAP资源指示的信令开销
在一些实施例中,为了减少非用户特定的A-MAP IE中的A-A-MAP组大小指示的信令开销,可以做出一些约束。仅8比特信令开销用于非用户特定的A-MAP IE中的A-A-MAP资源分配指示,这意味着必须移除A-A-MAP的一些MLRU组合。A-A-MAP区域中的与数据传输不相邻的未被占用的资源被浪费了。在A-A-MAP组中与数据资源相邻的未被占用的资源可以用于由ABS进行数据传输。
在下面的讨论中,根据一个实施例来描述四种情况。情况1和2是非FFR情况,情况3和4是FFR情况。
对于情况1,通过使用QPSK{1/2,1/4}的非FFR A-A-MAP,满足减少资源浪费的针对A-A-MAP的资源分配指示可以如下:
N总=(2*N1+N2)≤48
其中,N总(0≤N总≤48)是A-A-MAP的MLRU的总数量;N1(0≤N1≤24)是使用QPSK 1/4的组1中的A-A-MAP的数量;N2(0≤N2≤48)是使用QPSK 1/2的组2中的A-A-MAP的数量。用于减少浪费的第一规则是:N1可以是从0到24个MLRU的粒度,即[0:1:24](换言之,在0到24个MLRU之间不存在要被移除的粒度),并且N2可以是[0:1:48]。剩余组合的总数量是625,这仍然大于8比特信令开销的要求。下面是第二组合移除操作。在考虑5、7、8.75和10MHz带宽的情况下,可以保留不大于24的MLRU的组合,其大约是169个。在一个实施例中,可以通过两个步骤来移除从25到48的一些MLRU组合。首先,将IE的最大数量限制为不大于32,之后剩余组合的数量减小到320,这仍然大于87(=256-169)。第二,上述的320个组合将被进一步减小到87个。
Δ=320/[(320-(256-169)]=1.3734
其中Δ是移除步长。从新的索引1开始,每隔Δ个组合来均匀地移除组合。下面是要被移除的组合索引:
[1,2,4,5,6,8,9,10,12,13,15,16,17,19,20,21,23,24,26,27,28,30,31,32,34,35,37,38,39,41,42,43,45,46,48,49,50,52,53,54,56,57,59,60,61,63,64,65,67,68,70,71,72,74,75,76,78,79,81,82,83,85,86,87,89,90,92,93,94,96,97,98,100,101,103,104,105,107,108,109,111,112,113,115,116,118,119,120,122,123,124,126,127,129,130,131,133,134,135,137,138,140,141,142,144,145,146,148,149,151,152,153,155,156,157,159,160,162,163,164,166,167,168,170,171,173,174,175,177,178,179,181,182,184,185,186,188,189,190,192,193,195,196,197,199,200,201,203,204,206,207,208,210,211,212,214,215,216,218,219,221,222,223,225,226,227,229,230,232,233,234,236,237,238,240,241,243,244,245,247,248,249,251,252,254,255,256,258,259,260,262,263,265,266,267,269,270,271,273,274,276,277,278,280,281,282,284,285,287,288,289,291,292,293,295,296,298,299,300,302,303,304,306,307,309,310,311,313,314,315,317,318,319]。
对于情况2,通过使用QPSK{1/2,1/8}的非FFR A-A-MAP,生成用于减少资源浪费的针对A-A-MAP的资源分配指示可以是:
N总=(4*N1+N2)≤48
其中,N总(0≤N总≤48)是A-A-MAP的MLRU的总数量;N1(0≤N1≤12)是使用QPSK{1/8}的组1中的A-A-MAP的数量;N2(0≤N2≤48)是使用QPSK{1/2}的组2中的A-A-MAP的数量。
组1与数据传输不相邻,而组2与数据传输相邻。因此,组1中的未被占用的MLRU被浪费了。为了尽可能地减少浪费,应用第一规则以通过使N1[0:1:12]和N2[0:1:48]来移除组合。剩余组合的总数量减少到325,这仍然大于8比特信令开销的要求。
下面是第二组合移除操作。在考虑5、7、8.75和10MHz带宽的情况下,将保留不大于24的MLRU的组合,其大约是91个。
在一些实施例中,可以通过两个步骤来移除从25到48的一些MLRU组合。首先,将IE的最大数量限制为不大于32,之后剩余组合的数量减小到183,这仍然大于165(=256-91)。第二,上述的183个组合将被进一步减小到165个:
Δ=183/[183-(256-91)]=10.1667
其中Δ是移除步长。从新的索引1开始,每隔Δ个组合来均匀地移除组合。下面是将被移除的组合索引:[10,20,30,40,50,61,71,81,91,101,111,121,132,142,152,162,172,182]。
对于情况3,通过使用QPSK{1/2}的3个A-A-MAP组的FFR复用和使用QPSK{1/2,1/8}的1个A-A-MAP组的FFR复用,生成用于减少资源浪费的针对A-A-MAP的资源分配指示如下所示:
N总=(4*N1+N2+N3)≤48
其中,N总(0≤N总≤48)是A-A-MAP的MLRU的总数量;N1(0≤N1≤12)是使用QPSK 1/8的组1中的FFR复用1 A-A-MAP的数量;N2(0≤N2≤48)是使用QPSK 1/2的组2中的FFR复用1 A-A-MAP的数量;N3(0≤N3≤48)是使用QPSK 1/2的组3中的FFR复用3 A-A-MAP的数量。
组1与FFR复用1中的数据传输不相邻,组2与FFR复用1中的数据传输相邻,以及组3与FFR复用3中的数据传输相邻。因此,组1中的未被占用的MLRU被浪费了。为了尽可能地减少浪费,应用下面的规则以首先移除组合:N1可以是[0:1:12];N2可以是[0:4:48];N3可以是[0:4:48]。剩余组合的总数量减少到455,这仍然大于8比特信令开销的要求。
下面是第二组合移除操作。在考虑5、7、8.75和10MHz带宽的情况下,可以保留不大于24的MLRU的组合,其大约是84个。在一个实施例中,可以通过两个步骤来移除从25到48的一些MLRU组合。首先,将IE的最大数量限制为不大于32,之后剩余组合的数量减少到217,这仍然大于172(=256-84)。第二,上述的217个组合可以被进一步减少到172个:
Δ=217/[217-(256-84)]=4.8222
其中Δ是移除步长。从新的索引1开始,每隔Δ个组合来均匀地移除组合。下面是将被移除的组合索引:
[4,9,14,19,24,28,33,38,43,48,53,57,62,67,72,77,81,86,91,96,101,106,110,115,120,125,130,135,139,144,149,154,159,163,168,173,178,183,188,192,197,202,207,212,216]。
对于情况4,通过使用QPSK{1/2}的3个A-A-MAP组的FFR复用和使用QPSK{1/2,1/4}的1个A-A-MAP组的复用,用于减少资源浪费的针对A-A-MAP的资源分配指示可以是:
N总=(2*N1+N2+N3)≤48
其中,N总(0≤N总≤48)是A-A-MAP的MLRU的总数量;N1(0≤N1≤24)是使用QPSK 1/4的组1中的FFR A-A-MAP复用1的数量;N2(0≤N2≤48)是使用QPSK 1/2的组2中的FFR A-A-MAP复用1的数量;N3(0≤N3≤48)是使用QPSK 1/2的组3中的FFR A-A-MAP复用3的数量。
组1与FFR复用1中的数据传输不相邻,而组2与FFR复用1中的数据传输相邻,组3与FFR复用3中的数据传输相邻。因此,组1中的未被占用的MLRU被浪费了。为了尽可能地减少浪费,应用下面的规则以首先移除组合:N1可以是[0:1:24];N2可以是[0:5:48];N3可以是[0:5:48]。剩余组合的总数量减少到535,这仍然大于8比特信令开销的要求。下面是第二组合移除操作。
在考虑5、7、8.75和10MHz带宽的情况下,可以保留不大于24的MLRU的组合,其大约是92个。在一个实施例中,可以通过两个步骤来移除从25到48的一些MLRU组合。首先,将IE的最大数量限制为不大于32,之后剩余组合的数量减少到239,这仍然大于164(=256-92)。第二,上述的239个组合可以被进一步减少到164个:
Δ=239/[239-(256-92)]=3.1867
其中Δ是移除步长。从新的索引1开始,每隔Δ个组合来均匀地移除组合。下面是将被移除的组合索引:[3,6,9,12,15,19,22,25,28,31,35,38,41,44,47,50,54,57,60,63,66,70,73,76,79,82,86,89,92,95,98,101,105,108,111,114,117,121,124,127,130,133,137,140,143,146,149,152,156,159,162,165,168,172,175,178,181,184,188,191,194,197,200,203,207,210,213,216,219,223,226,229,232,235,238]。
通过移除A-A-MAP资源指示的一些组合,已经实现了非用户特定的A-MAP IE中的A-A-MAP资源分配指示,其可以被列表如下:
使用QPSK{1/4}的非FFR组1,以及使用QPSK{1/2}的组2;
使用QPSK{1/8}的非FFR组1,以及使用QPSK{1/2}的组2;
使用QPSK{1/8}的FFR组1、使用QPSK{1/2}的组2以及使用QPSK{1/2}的组3;
使用QPSK{1/4}的FFR组1、使用QPSK{1/2}的组2以及使用QPSK{1/2}的组3。
通过非用户特定的A-MAP以信号的形式发送每个分配A-MAP组中的分配A-MAP。如果A-MAP区域中存在使用两个MCS级的两个分配A-MAP组,则首先分配使用更强鲁棒性MCS的分配A-MAP组,然后分配使用更弱鲁棒性MCS的分配A-MAP组。
下面的表2、3、4和5示出了针对每个分配A-MAP组中的分配A-MAP的数量的索引。每个表被用于特定的分配A-MAP MCS集合和FFR配置。每个分配A-MAP组中的分配A-MAP的实际数量可以分别等于或小于由表2至5中的索引所指示的数量。
表2:针对非FFR配置的每个分配A-MAP组中的分配A-MAP的数量。组1使用QPSK 1/4而组2使用
QPSK 1/2
表3:针对非FFR配置的每个分配A-MAP组中的分配A-MAP的数量。组1使用QPSK 1/8而组2使用
QPSK 1/2
表4:针对FFR配置的每个分配A-MAP组中的分配A-MAP的数量。组1在复用1中使用QPSK 1/8,
组2在复用1中使用QPSK 1/2,以及组3在复用3中使用1/2。
表5:针对FFR配置的每个分配A-MAP组中的分配A-MAP的数量。组1在复用1中使用QPSK 1/4,组
2在复用1中使用QPSK 1/2,以及组3在复用3中使用QPSK 1/2。
参照图2,序列20可以在软件、固件或硬件中实现。在软件实现的实施例中,序列20可以由存储在诸如半导体、光或磁存储器之类的计算机可读介质中的指令来实现。那些指令可以由控制器或处理器执行。因此,例如,在一个实施例中,如图1所示,构成序列20的指令可以存储在基站12的存储设备18中。之后,那些指令可以由控制器16执行。
仍然参照图2,初始地,在框30,将表大小设置成等于256。对于情况1,将A-A-MAP组情况设置成等于[1,2]MLRU,对于情况2,设置成等于[1,4]MLRU,对于情况3,设置成等于[1,1,2]MLRU,以及对于情况4,设置成等于[1,1,4]MLRU。对于5MHz、7/8.75/10MHz和20MHz而言,每个组情况的最大MLRU分别是12、24和48。
之后,在框32,根据针对这四种情况中的每一种的第一规则,从等于0到48的MLRU来生成所有A-A-MAP情况的所有组合。即,在使用QPSK{1/2,1/4}的非FFR A-A-MAP的情况1中,第一规则是:N1可以是[0:1:24]并且N2可以是[0:1:48]。在使用QPSK{1/2,1/8}的非FFR A-A-MAP的情况2中,第一规则是:N1可以是[0:1:12]并且N2可以是[0:1:48]。在使用QPSK{1/2}的3个A-A-MAP组的FFR复用以及使用QPSK{1/2,1/8}的1个A-A-MAP组的FFR复用的情况3中,第一规则是:N1可以是[0:1:12]并且N2可以是[0:4:48]并且N3可以是[0:4:48]。在使用QPSK{1/2}的3个A-A-MAP组的FFR复用以及使用QPSK{1/2,1/4}的1个A-A-MAP组的复用的情况4中,N1可以是[0:1:24],N2可以是[0:5:48]并且N3可以是[0:5:48]。
之后,在棱形框34中,由检查来确定上述确定的组合是否大于所要求的256的表大小。如果否,则操作完成。
否则,在框36,应用第二组合移除规则。即,保留不大于24的MLRU的所有组合,并且将移除从25到48的一些MLRU组合。
最后,在框38,针对从MLRU 0到48的不同A-A-MAP组情况来获得表中的结果。
贯穿本说明书中提及的“一个实施例”或“实施例”意味着结合该实施例描述的特定特征、结构或特点包括在本发明所涵盖的至少一个实现中。因此,短语“一个实施例”或“在实施例中”的出现不是必须指代同一实施例。另外,可以以除了所示出的特定实施例之外的其它适当的形式来构建所述特定特征、结构或特点,并且所有这些形式都可以被涵盖在本申请的权利要求书中。
虽然已经参照有限数量的实施例描述了本发明,但是本领域技术人员将意识到据此的各种修改和变形。旨在使所附权利要求涵盖落入本发明实际精神和范围内的所有这些修改和变形。
Claims (25)
1.一种方法,包括:
将控制信息以信号的形式发送到站;
使用表来基于编码率指示组的大小;以及
仅使用组中的在频域中与数据资源相邻的未被占用的资源来确定所述大小。
2.根据权利要求1所述的方法,包括:限制所述表大小。
3.根据权利要求2所述的方法,包括:确定组合的数量是否大于所述表大小。
4.根据权利要求1所述的方法,包括:分成使用部分频率复用的情况和不使用部分频率复用的情况。
5.根据权利要求4所述的方法,包括:将不使用部分频率复用的所述情况分成使用不同的编码率的第一情况和第二情况。
6.根据权利要求5所述的方法,包括:将所述部分频率复用情况分成针对三个高级分配MAP(A-A-MAP)组的部分频率复用使用第一编码率和针对一个A-A-MAP组的复用使用第二和第三编码率的第三情况。
7.根据权利要求6所述的方法,还包括:将所述部分频率复用情况分成针对第一编码率使用三个组的部分频率复用和针对第二和第三编码率使用一个组的复用的第四情况。
8.根据权利要求7所述的方法,包括:将针对给定情况的逻辑资源单元的总数量限制为低于针对所述第一情况、所述第二情况、所述第三情况和所述第四情况中的每一种的单元的特定数量。
9.根据权利要求8所述的方法,包括:限制每种情况中的每个组的逻辑资源单元的数量。
10.根据权利要求9所述的方法,包括:针对所述第一情况,将所述逻辑资源单元的数量限制为一个和两个,针对所述第二情况,将所述逻辑资源单元的数量限制为一个和四个,针对所述第三情况,将所述逻辑资源单元的数量限制为一个、一个和两个,以及针对所述第四情况,将所述逻辑资源单元的数量限制为一个、一个和四个。
11.一种存储指令的计算机可读介质,所述指令由计算机执行以:
通过基于编码率指示组的大小,将控制信息发送到移动站;
在组中的与数据资源相邻的被占用的资源可以用于由所述站进行数据传输的基础上,确定所述大小;以及
仅使用组中的在频域中与数据资源相邻的未被占用的资源。
12.根据权利要求11所述的介质,还存储用于使用表来指示所述组的大小的指令。
13.根据权利要求12所述的介质,还存储用于限制所述表大小的指令。
14.根据权利要求13所述的介质,还存储用于确定组合的数量是否大于所述表大小的指令。
15.根据权利要求11所述的介质,还存储用于将所述控制信息分成使用部分频率复用的情况和不使用部分频率复用的情况的指令。
16.根据权利要求15所述的介质,还存储用于将不使用部分频率复用的所述情况分成使用不同的编码率的第一情况和第二情况的指令。
17.根据权利要求16所述的介质,还存储用于将所述部分频率复用情况分成针对三个A-A-MAP组的部分频率复用使用第一编码率和针对一个A-A-MAP组的复用使用第二和第三编码率的第三情况的指令。
18.根据权利要求17所述的介质,还存储用于将所述部分频率复用情况分成针对第一编码率使用三个组的部分频率复用和针对第二和第三编码率使用一个组的复用的第四情况的指令。
19.根据权利要求18所述的介质,还存储用于将针对给定情况的逻辑资源单元的总数量限制为低于针对所述第一情况、所述第二情况、所述第三情况和所述第四情况中的每一种的单元的特定数量的指令。
20.根据权利要求19所述的介质,还存储用于限制每种情况中的每个组的逻辑资源单元的数量,并且针对所述第一情况将所述逻辑资源单元的数量限制为一个和两个,针对所述第二情况将所述逻辑资源单元的数量限制为一个和四个,针对所述第三情况将所述逻辑资源单元的数量限制为一个、一个和两个,以及针对所述第四情况将所述逻辑资源单元的数量限制为一个、一个和四个的指令。
21.一种基站,包括:
收发器;
耦合到所述收发器的控制器;以及
所述站用于向移动站发送控制信息以基于编码率指示组的大小并且通过仅使用组中的在频域中与数据资源相邻的未被占用的资源来确定所述大小。
22.根据权利要求21所述的站,存储设备存储用于将表大小限制为256的指令。
23.根据权利要求21所述的站,所述站用于通过将情况分成使用部分频率复用的情况和不使用部分频率复用的情况来产生表以指示所述组的大小。
24.根据权利要求23所述的站,所述站还用于将不使用部分频率复用的所述情况分成使用不同的编码率的第一情况和第二情况。
25.根据权利要求24所述的站,所述站用于将所述部分频率复用情况分成针对三个高级分配MAP组的部分频率复用使用第一编码率和针对一个高级分配MAP组的复用使用第二和第三编码率的第三情况,以及针对第一编码率使用三个组的部分频率复用和针对第二和第三编码率使用一个组的复用的第四情况。
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