分组立即指配(3gpp 0408(3.5.2.1.3)协议英文翻译)

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3.5.2.1.3        分组立即指配3.5.2.1.3.1        一接收到“信道请求”消息  一接收到指示分组接入的“信道请求”消息，为了上行临时块流，网络可以分配一个临时流量识别和分配一个构成PDCH的上行链路资源。如果“信道请求”消息中建立的原因是一个单个块分组接入请求，如果网络分配MS资源，那么网络应该在指配的分组上行链路资源上仅仅允许单个块周期。如果“信道请求”消息中建立的原因是第一阶段分组接入请求，那么网络可以允许MS的一个第一阶段接入或一个单块分组接入。如果允许单块分组接入，那么网络将强制MS执行第二阶段分组接入。在接收“信道请求”消息的CCCH时隙上，以无证实模式发送的“立即指配”消息中，表明了指配给MS的分组上行链路资源。发送“立即指配消息”具体在下行链路CCCH的哪个时隙没有限制。网络启动T3141。这里“立即指配”消息包括：-“信道请求”消息的信息域，接收“信道请求”消息的帧的帧号。-分组信道描述-初始定时提前-分组上行链路指配结构如果应用跳频，那么网络可以利用在分组信道描述信息单元中的间接解码或者直接解码的频率结构。如果利用间接解码，那么MS利用在系统消息中接收的信息或者存储于前一个指配的信息来决定频率参数，见GSM 04.60。如果利用直接解码，那么MS利用小区分配的详细说明来解码移动分配。如果利用间接解码，“立即指配”消息可能包含一个CHANGE_MARK_1域。如果CHANGE_MARK_1域存在，那么MS应该修改“立即指配”消息涉及的伴随GPRS移动分配的SI13_CHANGE_MARK的合法性。如果CHANGE_MARK_1域和SI13_CHANGE_MARK不匹配，那么消息并不满足PDCH的定义。如果MS接收到一个“立即指配”消息，并且专用模式或TBF信息单元表明该消息是在一个two-message指配中的第一个消息，那么MS应该继续侦听所有CCCH。在两个复帧周期内，网络可能给MS发送紧接着第一个“立即指配”消息的第二个“立即指配”消息，详细说明分组信道面描述，如果需要的话，为了指配的一个一动分配。这两个在一个two-message 指配中的“立即指配”消息，其请求参考信息单元的内容应该相同。在两个复帧周期内，如果MS没有接收到紧接着第一个“立即指配”消息的第二个“立即指配”消息，MS应该放弃接收到的第一个“立即指配”消息。一接收到一个“立即指配”消息，或者在一个two-message指配的情况下，相应于最后3个“信道请求”消息的一对匹配的“立即指配”消息，MS停止定时器T3146（如果活动的话），停止发送“信道请求”消息，转向指配的PDCH。分组上行链路指配结构的内容表明了允许的分组接入：第一阶段分组接入还是单块分组接入。3.5.2.1.3        Packet immediate assignment3.5.2.1.3.1        On receipt of a CHANNEL REQUEST messageOn receipt of a CHANNEL REQUEST message indicating a packet access, the network may allocate a temporary flow identity and assign a packet uplink resource comprising one PDCH for an uplink temporary block flow.If the establishment cause in the CHANNEL REQUEST message indicates a request for a single block packet access, the network shall grant only the single block period on the assigned packet uplink resource if the network allocates resource for the mobile station.If the establishment cause in the CHANNEL REQUEST message indicates a request for one phase packet access, the network may grant either a one phase packet access or a single block packet access for the mobile station. If a single block packet access is granted, it forces the mobile station to perform a two phase packet access.The packet uplink resource is assigned to the mobile station in an IMMEDIATE ASSIGNMENT message sent in unacknowledged mode on the same CCCH timeslot on which the network has received the CHANNEL REQUEST message. There is no further restriction on what part of the downlink CCCH timeslot the IMMEDIATE ASSIGNMENT message can be sent. Timer T3141 is started on the network side.The IMMEDIATE ASSIGNMENT message contains:-        the information field of the CHANNEL REQUEST message and the frame number of the frame in which the CHANNEL REQUEST message was received;-        the packet channel description;-        the initial timing advance;-        the packet uplink assignment construction.If frequency hopping is applied, the network may use the indirect encoding or the direct encoding of the frequency configuration in the Packet Channel Description information element. If the indirect encoding is used, the mobile station uses information received in system information or stored from a previous assignment to determine the frequency parameters, see GSM 04.60. If the direct encoding is used, the mobile station uses the cell allocation defined for the cell to decode the mobile allocation.If the indirect encoding is used, the IMMEDIATE ASSIGNMENT message may contain a CHANGE_MARK_1 field. If that is present, the mobile station shall verify the validity of the SI13_CHANGE_MARK  associated with the GPRS mobile allocation to which the message refers, see GSM 04.60. If the CHANGE_MARK_1 field and the SI13_CHANGE_MARK  do not match, the message does not satisfactorily define a PDCH.If the mobile station receives an IMMEDIATE ASSIGNMENT message and the Dedicated mode or TBF information element indicates that this is the first message in a two-message assignment, the mobile station shall continue to listen to the full CCCH. The network may send a second IMMEDIATE ASSIGNMENT message to the mobile station within two multiframe periods following the first IMMEDIATE ASSIGNMENT message, specifying the packet channel description and, if required, a mobile allocation for the assignment. The two IMMEDIATE ASSIGNMENT messages in a two-message assignment shall have the same contents of the Request Reference information elements.If the mobile station does not receive the second IMMEDIATE ASSIGNMENT messages in a two-message assignment within two multiframe periods following the first message, the mobile station shall discard the first IMMEDIATE ASSIGNMENT message received.On receipt of an IMMEDIATE ASSIGNMENT message or, in case of a two-message assignment, a matching pair of IMMEDIATE ASSIGNMENT messages corresponding to one of its 3 last CHANNEL REQUEST messages, the mobile station stops T3146 (if running), stops sending CHANNEL REQUEST messages, and switches to the assigned PDCH.The content of the packet uplink assignment construction indicates which type of packet access is granted: one phase packet access or single block packet access