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跳頻參數(shù)MA和CA比特位的對(duì)應(yīng)關(guān)系是怎樣的？

提問(wèn)者: 琥珀漫步提問(wèn)時(shí)間: 2011-08-04

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問(wèn)題答案 ( 2 )

CA（Cell Allocation）表示小區(qū)分配的頻率集合,MA（Mobile Allocation）表示每次通信中移動(dòng)臺(tái)和基站所用的頻率集（1≤N≤64），
MA和CA都是小區(qū)級(jí)表。

回答者： nmvcv 回答時(shí)間：2011-08-04 21:28

樓主可以參考下這個(gè)文章
http://blog.sina.com.cn/s/blog_64c55a870100kd7a.html

CA是Cell Channel Description，小區(qū)分配表。MA是Mobile Allocation，移動(dòng)分配表，這里不是多時(shí)隙配置的意思。

44.018協(xié)議對(duì)CA的描述：
10.5.2.1b Cell Channel Description
The purpose of the Cell Channel Description information element is to provide the reference frequency list to be used to decode the mobile allocation information element.即CA中存放的也是頻率列表，但這些頻率是供MA信元解碼用的。也就是說(shuō)，如果沒(méi)有這個(gè)CA信元，就不能對(duì)MA信元進(jìn)行解碼。
The Cell Channel Description is a type 3 information element with 17 octets length.
There are several formats for the Cell Channel Description information element, distinguished by the "format indicator" subfield. Some formats are frequency bit maps, the others use a special encoding scheme.
NOTE: No more than 64 RF channels should be encoded in the Cell Allocation since this is the maximum number of RF channels which can be referenced in the Mobile Allocation IE.需要注意的是，由于MA信元中最多只有64個(gè)頻率，因此CA的頻點(diǎn)也不應(yīng)該超過(guò)64個(gè)。
10.5.2.1b.1 General description
Figure 10.5.2.1b.1.1/44.018 shows only a special bit numbering. The different general format is described in table 10.5.2.1b.1.1/44.018.

Figure 10.5.2.1b.1.1: Cell Channel Description information element (general format)
Table 10.5.2.1b.1.1: Cell Channel Description information element, general format

FORMAT-ID, Format Identifier (Bit 128 and next)
The different formats are distinguished by the bits of higher number. The possible values are the following:
Bit Bit Bit Bit Bit         format notation
128 127 124 123 122
0   0   X   X   X          bit map 0
1   0   0   X   X         1024 range
1   0   1   0 0         512 range
1 0   1   0 1         256 range
1   0   1 1   0         128 range
1   0 1   1   1          variable bit map
All other combinations are reserved for future use.
A GSM 900 mobile station which only supports the primary GSM band P-GSM 900 (cf. 3GPP TS 45.005) may consider all values except the value for bit map 0 as reserved.
The significance of the remaining bits depends on the FORMAT-ID. The different cases are specified in the next sub-clauses.
Mobile stations shall treat all ARFCNs in the set {0, 1, 2 ... 1023} as valid ARFCN values even if the mobile station is unable to transmit or receive on that ARFCN.

44.018協(xié)議對(duì)MA的描述則要簡(jiǎn)單的多：
10.5.2.21 Mobile Allocation
The purpose of the Mobile Allocation information element is to provide that part of the RF channels belonging to the cell allocation (coded with a "1" in the cell channel description information element) which is used in the mobile hopping sequence.也就是說(shuō)，MA中提供的是跳頻的頻點(diǎn)序列，而且是CA中部分的頻點(diǎn)。只有當(dāng)MA的某個(gè)位為1的時(shí)候，才包含CA數(shù)組中對(duì)應(yīng)的頻點(diǎn)。具體可參考下面的例子分析。
The Mobile Allocation information element is coded as shown in figure 10.5.2.21.1 and table 10.5.2.21.1.
The Mobile Allocation is a type 4 information element with 3 to 10 octets length except for the cases specified in sub-clauses 9.1.18.1 and 9.1.19.2.

Figure 10.5.2.21.1: Mobile Allocation information element
Table 10.5.2.21.1: Mobile Allocation information element

MA C i, Mobile allocation RF channel i (octet 3 etc.), i = 1, 2,..., NF
The MA C i bit indicates whether or not the Mobile allocation frequency list includes the i'th frequency in the cell allocation frequency list. The cell allocation frequency list is derived from the set of frequencies defined by the reference cell channel description information element. NF denotes the number of frequencies in the cell allocation frequency list. In the cell allocation frequency list the absolute RF channel numbers are placed in increasing order of ARFCN, except that ARFCN 0, if included in the set, is put in the last position in the list,
For a RF channel belonging to the mobile allocation the MA C i bit is coded with a "1"; i = 1, 2,..., NF.
For a RF channel not belonging to the mobile allocation the MA C i bit is coded with a "0"; i = 1, 2,..., NF.
If NF mod 8 <> 0 then bits NF to 8n in octet 3 must be coded with a "0" in each.

舉個(gè)例子講述如何用CA對(duì)MA進(jìn)行解碼。比如現(xiàn)在CA列表數(shù)據(jù)為（當(dāng)然該數(shù)據(jù)是網(wǎng)側(cè)下發(fā)的）：

0x 62 （IEI）
0x 01 （按照上面協(xié)議的介紹，bit128=bit127=0，因此該CA表需按照bit map 0格式解碼。且此時(shí)CA表中含頻點(diǎn)N=121）
0x 02   N=114
0x 04   N=107
0x 08   N=100
0x 10   N=93
0x 00
0x 00
0x 00
0x 00
0x 00
0x 00
0x 00
0x 00
0x 00
0x 00
0x 00
因此，該CA列表包含5個(gè)頻點(diǎn)，分別是N=93、100、107、114和121。那么包含64個(gè)元素的數(shù)組“小區(qū)信道描述”的前5個(gè)元素就應(yīng)該是這5個(gè)數(shù)值。

了解一下Bitmap 0的編解碼格式：
10.5.2.1b.2 Bit map 0 format

Figure 10.5.2.1b.2.1: Cell Channel Description information element, bit map 0 format
Table 10.5.2.1b.2.1: Cell channel Description information element, bit map 0 format

CA ARFCN N, Cell Allocation Absolute RF Channel Number N (octet 2 etc.)
For a RF channel with ARFCN = N belonging to the cell allocation the CA ARFCN N bit is coded with a "1"; N = 1, 2, .., 124.
For a RF channel with ARFCN = N not belonging to the cell allocation the CA ARFCN N bit is coded with a "0"; N = 1, 2 .., 124.

假定從網(wǎng)側(cè)下發(fā)（如信道切換命令消息）的MA的數(shù)據(jù)為：

0x 72 IEI
0x 08 長(zhǎng)度
0x A8
0x 02
0x 05
0x 10
0x 00
0x 00
0x 02 0000-0010
0x 31 0011-0001

那么通過(guò)CA對(duì)MA解碼步驟為：
1. 由于前面已知CA頻點(diǎn)個(gè)數(shù)為5個(gè)，因此只有ARFCN 001-005這5個(gè)頻率有可能屬于MA，即MA不包括其他頻點(diǎn)，只可能包括這5個(gè)頻點(diǎn)。而MA是否一定包括所有的這5個(gè)頻點(diǎn)，還要看對(duì)應(yīng)BIT位是否為1。
2. 解碼各個(gè)BIT位（CA表包括：N=93、100、107、114和121）。
CA ARFCN 001=1表示N=93包含在MA列表中。
CA ARFCN 005=1表示N=121包含在MA列表中。

回答者： OscarDon 回答時(shí)間：2011-08-04 22:33

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