Power efficient UE side mechanism for receiving BMC messages

摘要

A UE side Broadcast/Multicast Control (BMC) protocol layer determines those Cell Broadcast Service (CBS) messages (and their repetitions) which the UE shall read or ignore in a succeeding CBS schedule period, based on the CBS Schedule Message contents (Message Description Type and New Message Bitmap) received in a current CBS schedule period, the CBS messages already stored in the BMC, and the CBS messages to be received. In this manner, the UE may ignore CBS messages it has already received, without knowledge of the CBS message serial numbers, and thus conserve resources such as battery power.

主权项

1. A method of efficiently receiving Broadcast/Multicast Control (BMC) protocol messages by a BMC layer in User Equipment operative in a wireless communication network, comprising:
maintaining a first list comprising Message IDs of Cell Broadcast Service (CBS) messages to be received during a succeeding CBS schedule period; maintaining a second list comprising Message IDs of received CBS messages; receiving a CBS schedule message; determining, from the CBS schedule message, all CBS messages scheduled to be broadcast in the succeeding CBS schedule period; adding to the first list, all scheduled CBS messages indicated in the CBS schedule message as new or repetition of new; adding to the first list, all scheduled CBS messages indicated as old or repetition of old that are not included in the second list; adding to the first list, all scheduled CBS messages indicated as old or repetition of old that are included in the second list and for which the corresponding Common Traffic Channel (CTCH) block set (BS) Index in the CBS schedule message is indicted as new in a New Message Bitmap information element (IE); and configuring resources to receive only the CBS messages in the first list, as well as a CBS schedule message, in the succeeding CBS schedule period.