Patent ID: 8665827
Filing Date: 2014-03-04
Classification: H04W

Abstract:
1. A method for mobile station handover, the method comprising: receiving information about neighboring base stations (BSs) from a current serving base station (BS) of a mobile station (MS); scanning the neighboring BSs according to the neighboring BS information received from the current serving BS; when no neighboring BS having the same bandwidth as the current serving BS fulfills requirements, scanning and measuring signal quality of neighboring BSs with a different bandwidth and selecting a plurality of BSs compliant with signal quality requirements and suitable as target BSs to make up a target BS list, wherein the scanning and measuring signal quality of the neighboring BSs comprises, by the MS: adjusting physical layer parameters for handover to a channel bandwidth of the scanned BSs within a scan interval; reserving Media Access Control (MAC) layer information and other upper-layer information; buffering current service flow data; and then scanning and measuring signal quality of the neighboring BSs with a different bandwidth: and then readjusting physical layer parameters to recover communications with the current serving BS after completion of scanning; then performing a handover to a target BS in the target BS list wherein performing the handover comprises: sending, by the MS, a first message to the current serving BS when the MS needs to be handed over, wherein the first message carries target BS list information; by the currently serving BS of the MS, parsing the first message after receiving the first message to obtain and store an SS Basic Capability Request (SBC-REQ) message and a Registration Request (REG-REQ) message carried in the first message, and sending a second message to a network-side gateway, wherein the second message carries the target BS list and an MS context; by the network-side gateway, distributing the second message to all target BSs in the target BS list after receiving the second message; or selecting several target BSs in the target BS list according to load conditions of each target BS after receiving the second message, using the selected target BSs to make up a second target BS list, adding the second target BS list to the second message, and distributing the second message to all target BSs in the second target BS list; or selecting several target BSs in the target BS list according to the load conditions of each target BS after receiving the second message, using the selected target BSs to make up a second target BS list, calculating a new Authorization Key (AK) context of the MS, adding the second target BS list and the new AK context to the second message, and distributing the second message to all target BSs in the second target BS list; replying, by the target BS that receives the second message, a third message to the network-side gateway, wherein the third message carries a handover-allowed flag; sending, by the network-side gateway, a fourth message to the current serving BS of the MS after receiving the third message replied by each target BS, wherein the fourth message sent by the gateway to the current serving BS carries the third message replied by all target BSs that respond successfully; sending, by the current serving BS of the MS, an air interface message to the MS after receiving the fourth message, wherein the air interface message carries the third message replied by all target BSs that respond successfully in the fourth message; and selecting, by the MS, a target BS for handover from the target BS list in the air interface message or from the second target BS list after receiving the air interface message.