LTE终端能力等级 Category
Category終端能力等級，表明了終端所支持的數據處理能力（下載、上傳速率）、最大的空分復用、調制編碼能力等。
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詳細可參考 3GPP36.306。在R8版本中定義了5類終端，在R10中定義了8類終端....隨著版本演進，不斷有新的終端被定義！?
| R8 | R9 | R10 | R11 | R12 |
| Category 1 | Category 1 | Category 1 | Category 1 | Category 1 |
| Category 2 | Category 2 | Category 2 | Category 2 | Category 2 |
| Category 3 | Category 3 | Category 3 | Category 3 | Category 3 |
| Category 4 | Category 4 | Category 4 | Category 4 | Category 4 |
| Category 5 | Category 5 | Category 5 | Category 5 | Category 5 |
| - | - | Category 6 | Category 6 | Category 6 |
| - | - | Category 7 | Category 7 | Category 7 |
| - | - | Category 8 | Category 8 | Category 8 |
| - | - | - | Category 9 | Category 9 |
| - | - | - | Category 10 | Category 10 |
| - | - | - | Category 11 | Category 11 |
| - | - | - | Category 12 | Category 12 |
| - | - | - | - | Category 13 |
| - | - | - | - | Category 14 |
| - | - | - | - | Category 15 |
?目前3GPP更新到了R12，15類終端，但還有很多信息沒有說清楚！以RC40版本來說，信息如下！
?下行物理信道參數設置
| UE 類別 | Maximum number of DL-SCH transport block bitsreceived within a TTI | Maximum number of bits of a DL-SCH transport blockreceived within a TTI | 軟信道比特總數 | 支持下行空分復用的最大層數 |
| Category1 | 10296 | 10296 | 250368 | 1 |
| Category2 | 51024 | 51024 | 1237248 | 2 |
| Category3 | 102048 | 75376 | 1237248 | 2 |
| Category4 | 150752 | 75376 | 1827072 | 2 |
| Category5 | 299552 | 149776 | 3667200 | 4 |
| Category6 | 301504 | 149776 (4layers) | 3654144 | 2 or4 |
| 75376 (2layers) | ||||
| Category7 | 301504 | 149776 (4layers) | 3654144 | 2 or4 |
| 75376 (2layers) | ||||
| Category8 | 2998560 | 299856 | 35982720 | 8 |
| Category9 | 452256 | 149776 (4layers) | 5481216 | 2 or4 |
| 75376 (2layers) | ||||
| Category10 | 452256 | 149776 (4layers) | 5481216 | 2 or4 |
| 75376 (2layers) | ||||
| Category11 | 603008 | 149776 (4layers, 64QAM) | 7308288 | 2 or4 |
| 195816 (4layers, 256QAM) | ||||
| 75376 (2layers, 64QAM) | ||||
| 97896 (2layers, 256QAM) | ||||
| Category12 | 603008 | 149776 (4layers, 64QAM) | 7308288 | 2 or4 |
| 195816 (4layers, 256QAM) | ||||
| 75376 (2layers, 64QAM) | ||||
| 97896 (2layers, 256QAM) |
?上行物理信道參數配置?
| UECategory | Maximum number of UL-SCH transport block bits transmittedwithin a TTI | Maximum number of bits of an UL-SCH transport blocktransmitted within a TTI |
| Category1 | 5160 | 5160 |
| Category2 | 25456 | 25456 |
| Category3 | 51024 | 51024 |
| Category4 | 51024 | 51024 |
| Category5 | 75376 | 75376 |
| Category6 | 51024 | 51024 |
| Category7 | 102048 | 51024 |
| Category8 | 1497760 | 149776 |
| Category9 | 51024 | 51024 |
| Category10 | 102048 | 51024 |
| Category11 | 51024 | 51024 |
| Category12 | 102048 | 51024 |
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這里需要說明終端的最大下行速率和最大上行速率
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以下行舉例來說，有2個參數：
Maximum number of DL-SCH transport block bitsreceived within a TTI
//在一個TTI內可接收的最大DL-SCH傳輸塊bit數
Maximum number of bits of a DL-SCH transport blockreceived within a TT
//在一個TTI內可接收一個傳輸塊的DS-SCH傳輸塊最大bit數
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一個TTI就是1ms
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舉例來說：Category3
Maximum number of DL-SCH transport block bitsreceived within a TTI??????=102048
那么下行速率可達100Mbps
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Maximum number of bits of a DL-SCH transport blockreceived within a TTI??=75376
一個傳輸塊的下行速率可達75Mbps
Category3最大可支持2層傳輸，2個傳輸塊的最大傳輸速率可達=75376*2=150Mbps
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但Maximum number of DL-SCH transport block bitsreceived within a TTI最大速率只有100Mbps，所以Category3最大速率=MIN(Maximum number of DL-SCH transport block bits receivedwithin a TTI, Maximum number of bits of a DL-SCH transport blockreceived within a TTI*層數)=100Mbps
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上行所支持的最大速率同樣類似?
| Category | 支持的最大層數 | 最大速率 | ||
| 下行 | 上行 | 下行 | 上行 | |
| Category 1 | 1 | 1 | 10 | 5 |
| Category 2 | 2 | 1 | 50 | 25 |
| Category 3 | 2 | 1 | 100 | 50 |
| Category 4 | 2 | 1 | 150 | 50 |
| Category 5 | 4 | 1 | 300 | 75 |
| Category 6 | 2 | 1 | 150 | 50 |
| 4 | 1 | 300 | ||
| Category 7 | 2 | ？ | 150 | ？ |
| 4 | 300 | |||
| Category 8 | 8 | 1 | 300 | 150 |
| Category 9 | 2 | 1 | 150 | 50 |
| 4 | 450 | |||
| Category 10 | 2 | ？ | 190 | ？ |
| 4 | 600 | |||
| Category 11 | 2 | 1 | 190 | 50 |
| 4 | 600 | |||
| Category 12 | 2 | ？ | 190 | ？ |
| 4 | 600 | |||
?在調制方式方面，下行方向從CAT11開始支持256QAM調制方式，上行方向部分終端已開始支持64QAM了
| Category | 數據信道支持的調制方式 | |
| 下行 | 上行 | |
| Category 1 | QPSK, 16QAM, 64QAM | QPSK, 16QAM |
| Category 2 | QPSK, 16QAM | |
| Category 3 | QPSK, 16QAM | |
| Category 4 | QPSK, 16QAM | |
| Category 5 | QPSK, 16QAM, 64QAM | |
| Category 6 | QPSK, 16QAM | |
| Category 7 | QPSK, 16QAM | |
| Category 8 | QPSK, 16QAM, 64QAM | |
| Category 9 | QPSK, 16QAM | |
| Category 10 | QPSK, 16QAM | |
| Category 11 | QPSK, 16QAM | QPSK, 16QAM |
| Category 12 | QPSK, 16QAM | |
| Category 13 | QPSK, 16QAM | |
| Category 14 | QPSK, 16QAM | |
| Category 15 | QPSK, 16QAM, 64QAM | |
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如何查看終端的category呢？可以通過信令來確認，在信令UECapabilityInformation的UE-EUTRA-Capability中有ue-Category的信息。
–?????????????????????UE-EUTRA-Capability
The IEUE-EUTRA-Capability is used to convey the E-UTRA UE Radio AccessCapability Parameters [5] to the network.
UE-EUTRA-Capability information element
-- ASN1START
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UE-EUTRA-Capability::=?????????????SEQUENCE {
???accessStratumRelease????????????AccessStratumRelease,
???ue-Category?????????????????????????INTEGER(1..16),????????????????????-- value range FFS
???pdcp-Parameters?????????????????????PDCP-Parameters,
???phyLayerParameters??????????????PhyLayerParameters,
???rf-Parameters???????????????????RF-Parameters,
???measurementParameters???????????MeasurementParameters,
???interRAT-Parameters?????????????????SEQUENCE {
??????utraFDD?????????????????????????IRAT-UTRA-FDD-Parameters????????????OPTIONAL,
??????utraTDD128??????????????????????IRAT-UTRA-TDD128-Parameters????????????OPTIONAL,
……
–?????????????????????UECapabilityInformation
TheUECapabilityInformation message is used to transfer of UEradio access capabilities requested by the E?UTRAN.
Signalling radio bearer:SRB1
RLC-SAP: AM
Logical channel:DCCH
Direction: UE toE?UTRAN
UECapabilityInformation message
-- ASN1START
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UECapabilityInformation::=?????????SEQUENCE {
???rrc-TransactionIdentifier???????RRC-TransactionIdentifier,
???criticalExtensions??????????????CHOICE {
??????c1??????????????????????????????CHOICE{
??????????ueCapabilityInformation-r8??????????UECapabilityInformation-r8-IEs,
??????????spare7 NULL,
??????????spare6 NULL, spare5 NULL, spare4 NULL,
??????????spare3 NULL, spare2 NULL, spare1 NULL
??????},
??????criticalExtensionsFuture????????SEQUENCE {}
???}
}
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UECapabilityInformation-r8-IEs::=?? SEQUENCE (SIZE(1..maxRAT-Capabilities)) OF SEQUENCE {
???rat-Type????????????????????????RAT-Type,
???ueCapabilitiesRAT-Container?????????OCTET STRING,
???nonCriticalExtension????????????SEQUENCE{}?????????????????????????OPTIONAL
}
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-- ASN1STOP
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| UECapabilityInformation field descriptions |
| ueCapabilitesRAT-Container Container forthe UE capabilities of the indicated RAT. The encoding is definedin the specification of each RAT: For E?UTRA: the encoding of UE capabilities is defined inIE UE-EUTRA-Capability. For UTRA: theencoding of UE capabilities is defined in IE [FFS] TS 25.331[19]. For GERAN: theencoding of UE capabilities is defined in IE [FFS] [24.008 and/ or44.018; FFS]. ForCDMA2000-1xRTT Bandclass: the encoding of UE capabilities isdefined in IE [A.S.0008;? FFS] |
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