LTE category New

Category终端能力等级，表明了终端所支持的数据处理能力（下载、上传速率）、最大的空分复用、调制编码能力等。

 

详细可参考 3GPP36.306。在R8版本中定义了5类终端，在R10中定义了8类终端....随着版本演进，不断有新的终端被定义！ 

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类终端，但还有很多信息没有说清楚！以RC40版本来说，信息如下！

 下行物理信道参数设置

UE 类别	Maximum number of DL-SCH transport block bitsreceived within a TTI	Maximum number of bits of a DL-SCH transport blockreceived within a TTI	软信道比特总数	支持下行空分复用的最大层数
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)

 

上行物理信道参数配置 

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

 

这里需要说明终端的最大下行速率和最大上行速率

 

以下行举例来说，有2个参数：

Maximum number of DL-SCH transport block bitsreceived within a TTI

//在一个TTI内可接收的最大DL-SCH传输块bit数

Maximum number of bits of a DL-SCH transport blockreceived within a TT

//在一个TTI内可接收一个传输块的DS-SCH传输块最大bit数

 

一个TTI就是1ms

 

举例来说：Category3

Maximum number of DL-SCH transport block bitsreceived within a TTI      =102048

那么下行速率可达100Mbps

 

Maximum number of bits of a DL-SCH transport blockreceived within a TTI  =75376

一个传输块的下行速率可达75Mbps

Category3最大可支持2层传输，2个传输块的最大传输速率可达=75376*2=150Mbps

 

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*层数)=100Mbps

 

上行所支持的最大速率同样类似 

Category	支持的最大层数		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

 

在调制方式方面，下行方向从CAT11开始支持256QAM调制方式，上行方向部分终端已开始支持64QAM了

Category	数据信道支持的调制方式
	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 64QAM，256QAM	QPSK, 16QAM
Category 12		QPSK, 16QAM
Category 13		QPSK, 16QAM
Category 14		QPSK, 16QAM
Category 15		QPSK, 16QAM, 64QAM

 

如何查看终端的category呢？可以通过信令来确认，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

 

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

 

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 {}

   }

}

 

UECapabilityInformation-r8-IEs::=   SEQUENCE (SIZE(1..maxRAT-Capabilities)) OF SEQUENCE {

   rat-Type                        RAT-Type,

   ueCapabilitiesRAT-Container         OCTET STRING,

   nonCriticalExtension            SEQUENCE{}                         OPTIONAL

}

 

-- ASN1STOP

 

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]