Enhanced multi-user packets with extended MAC index space for wireless communications
View Patent ↗The present invention provides methods for identifying the target mobile stations for data transmission in a wireless communication network. An enhanced Multi-User Packet format that supports both the legacy MAC Index and the new extended MAC Index in the same packet is described. The length of extended MAC Index can be variable.
1. A method for wireless communications, comprising:
providing in a forward data packet, in a Media Access Control (MAC) Layer generated from a base station, a MAC header sequence and a MAC payload sequence subsequent to the MAC header sequence, wherein the MAC header sequence includes mobile station identification information to identify one or more mobile stations, and the MAC payload sequence includes data packets directed to the one or more mobile stations;
including in the MAC header sequence one or more first MAC index fields that are respectively assigned first MAC index values up to a maximum MAC index value to identify respective mobile stations;
including in the MAC header sequence one or more second MAC index fields that are respectively assigned second MAC index values greater than the maximum MAC index value; and
including a redirect MAC index field in the MAC header sequence at a position in time prior to the first MAC index fields and the second MAC index fields to direct a target mobile station to read the one or more first MAC index fields when the target mobile station is assigned a MAC index value less than the maximum MAC index value and to read the one or more second MAC index fields when the target mobile is assigned a MAC index value greater than the maximum MAC index value, wherein the redirect MAC index value is not used to identify a particular mobile station.
2. The method as in claim 1 , further comprising:
designating one of 128 MAC index values assigned to the base station under IS-856 Revision A as a value to the redirect MAC index field; and
using one of remaining 127 MAC index values assigned to the base station for each first MAC index field.
3. The method as in claim 1 , further comprising:
causing the target mobile station, which is assigned a MAC index value less than the maximum MAC index value in one of the one or more first MAC index fields, to treat a value in the redirect MAC index field as a first MAC index value for another mobile station and continue to read a subsequent first MAC index field; and
causing the target mobile station, which is assigned a MAC index value greater than the maximum MAC index value in one of the one or more second MAC index fields, to skip the one or more first MAC index fields to read the one or more second MAC index fields.
4. The method as in claim 1 , further comprising:
providing a second MAC index trailer in the MAC header sequence for each of the one or more second MAC index fields to store most significant bits of a MAC index number; and
using the respective second MAC index field to store least significant bits of the respective MAC index number.
5. The method as in claim 1 , further comprising:
providing a second MAC index trailer in the MAC header sequence for at least one of the one or more second MAC index fields to store most significant bits of a difference based on an assigned MAC index number.
6. A wireless communication system, comprising:
a plurality of base stations, each base station is operable to
provide in a forward data packet, in a Media Access Control (MAC) Layer generated from a base station a MAC header sequence and a MAC payload sequence subsequent to the MAC header sequence, wherein the MAC header sequence includes mobile station identification information to identify one or more mobile stations, and the MAC payload sequence includes data packets directed to the one or more mobile stations;
include in the MAC header sequence one or more first MAC index fields that are respectively assigned first MAC index values up to a maximum MAC index value to identify respective mobile stations;
include in the MAC header sequence one or more second MAC index fields that are respectively assigned second MAC index values greater than the maximum MAC index value; and
include a redirect MAC index field in the MAC header sequence at a position in time prior to the first MAC index fields and the second MAC index fields to direct a target mobile station to read the one or more first MAC index fields when the target mobile station is assigned a MAC index value less than the maximum MAC index value and to read the one or more second MAC index fields when the target mobile is assigned a MAC index value greater than the maximum MAC index value, wherein the redirect MAC index value is not used to identify a particular mobile station.