System and method for enabling multicast in a CDMA network
First Claim
1. A system providing native physical and link layer support for handling multicast messaging in a wireless telecommunication network operating to communicate with mobile stations according to a CDMA air-interface standard, the mobile stations being members of a multicast group, said system comprising:
- a base station transceiver (BTS) for communicating with the mobile stations over the air interface; and
a base station controller (BSC) for controlling the BTS and assigning Walsh codes for use in message processing by the BTS and by the mobile stations, wherein the BSC assigns a first multicast Walsh code for use by the BSC in processing multicast control messages for transmission to the mobiles stations belonging to the multicast group.
2 Assignments
0 Petitions
Accused Products
Abstract
An improved wireless communications system for efficiently delivering multicast transmissions within a CDMA wireless communications network. To minimize use of network resources, a multicast group Walsh code is dynamically assigned for transmissions to group members for the duration of the session. Reverse link multicast long code covers are assigned by a base station controller and transmitted to the mobile station on a forward channel as derived from the multicast IP address. A multicast reflection function is provided at the base station controller or the IP gateway to transmit multicast messages received from mobile stations to other group members in their coverage area. The assigned group Walsh codes and long codes are used to spread all multicast transmissions on the CDMA forward and reverse channels, respectively.
48 Citations
28 Claims
-
1. A system providing native physical and link layer support for handling multicast messaging in a wireless telecommunication network operating to communicate with mobile stations according to a CDMA air-interface standard, the mobile stations being members of a multicast group, said system comprising:
-
a base station transceiver (BTS) for communicating with the mobile stations over the air interface; and
a base station controller (BSC) for controlling the BTS and assigning Walsh codes for use in message processing by the BTS and by the mobile stations, wherein the BSC assigns a first multicast Walsh code for use by the BSC in processing multicast control messages for transmission to the mobiles stations belonging to the multicast group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method for handling multicast messages involving mobile stations in communication with a CDMA wireless network, the message having at least one base station system (BSS) for communicating with mobile stations, said method comprising the steps of:
-
determining that a mobile station is operating in the area covered by the BSS;
receiving a reverse-link request from the mobile station to join a multicast group;
assigning a first Walsh code for processing forward link multicast messages to members of the multicast group; and
transmitting the group Walsh code assignment to the mobile station on a forward link. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
Specification