Long code mask collision mitigation on networks using pseudo ESNs
A cellular communications system capable of detecting long code mask collisions in the reverse link on call setup or call handoff comprises means for assigning a different carrier for the reverse link for one of the duplicate calls, for avoiding interference and dropped calls.
1 . A method for mitigating interference between two users of a wireless telecommunications network, comprising the steps of:
detecting a first unique identifier of a first user in a telecommunications cell of said network;
detecting a second unique identifier of a second user in the cell;
determining whether said first unique identifier and said second unique identifier match;
assigning at least one channel of the second user to a carrier different from a carrier assigned to said first user.
2 . A method according to claim 1 , wherein the telecommunications network comprises a Code Division Multiple Access (CDMA) network.
3 . A method according to claim 2 , wherein said channel is a reverse link.
4 . A method according to claim 3 , wherein said first unique identifier determines a long code mask.
5 . A method according to claim 4 , wherein said first unique identifier comprises a long code mask.
6 . A method according to claim 4 , wherein said first unique identifier is an Electronic Serial Number (ESN).
7 . A method according to claim 4 , wherein said first unique identifier is derived from a Mobile Equipment Identifier (MEID).
8 . A method according to claim 7 , wherein said first unique identifier is a pseudo ESN.
9 . A method according to claim 1 , wherein said step of detecting a second unique identifier comprises detecting said second unique identifier during call setup for said second user.
10 . A method according to claim 1 , wherein said step of detecting a second unique identifier comprises detecting said second unique identifier during a call handoff.
11 . A Code Division Multiple Access (CDMA) wireless communication apparatus, comprising a processing platform configured and arranged to:
determine whether a first wireless station accessing a cell in a cellular network has a unique identifier matching a second wireless station being serviced in said cell; and
assign at least one channel for said first wireless station to a different carrier than that of said second wireless station, responsive to determining that the unique identifier matches the second wireless station.
12 . An apparatus according to claim 11 , wherein said channel is a reverse link channel.
13 . An apparatus according to claim 12 , wherein said unique identifier determines a long code mask.
14 . An apparatus according to claim 13 , wherein said unique identifier is derived from a Mobile Equipment Identifier (MEID).
15 . An apparatus according to claim 11 , wherein the processing platform comprises:
a data store for storing said unique identifiers of wireless stations being serviced in said cell; and
means for determining a match between the unique identifier received from said first wireless station and the unique identifier of said second wireless station stored in said data store.
16 . An apparatus according to claim 15 wherein the processing platform further comprises means for assigning a channel for said first wireless station to a different carrier than that of said second wireless station, responsive to a determination that the unique identifier matches that of the second wireless station.
17 . An apparatus according to claim 11 , wherein the processing platform is further configured and arranged to determine whether a match occurs during call handoff into said cell for said first wireless station.
18 . A mobile station for use in a Code Division Multiple Access (CDMA) cellular telecommunications network, comprising:
means for receiving from a cellular base station an indication that the mobile station has a duplicate identifier in a cell in said network; and
means for facilitating selection of an alternate carrier in said cell responsive to the receiving means receiving said indication.
19 . A mobile station according to claim 18 , wherein said means for facilitating selection of an alternate carrier is disposed to initiate a switchover from an original carrier assigned by said base station to an alternate carrier assigned by said base station.
20 . A mobile station according to claim 19 , wherein said original carrier and said alternate carrier carry a reverse link channel.