| 摘要 |
Radio network subsystems (RNSs) are provided that are in communications with a core network (CN). One of the RNSs is an SRNS, and another RNS is a target RNS (TRNS). The SRNS is in wireless communications with a mobile unit to provide service data units (SDUs) from the CN to the mobile unit. The SRNS associates a sequence number (SN) with each of the SDUs, and the mobile unit is capable of confirming to the SRNS SDUs received from the SRNS. Forwarding information is provided by SRNS to the TRNS. The forwarding information includes SDUs unconfirmed as received by the mobile unit, a first SN that is the SN of the sequentially earliest unconfirmed SDU, and a second SN that is the SN of the sequentially last unconfirmed SDU actually transmitted to the mobile unit by the SRNS. Finally, the TRNS is made the new SRNS for the mobile unit.
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