EFFICIENT HANDOVER EXECUTION METHOD OF TERMINAL IN BROADBAND WIRELESS ACCESS SYSTEM INCLUDING MULTIPLE FEMTO BASE STATIONS
First Claim
1. A method for performing handover carried out by a terminal in a radio access system, wherein multiple femto base stations including a serving femto base station form a single group, the method comprising:
- transmitting a request message for requesting a seamless handover within the formed group to the serving femto base station;
receiving a first command message from the serving femto base station, the first command message including transmission power information and dedicated uplink resource allocation information being commonly applied to the formed group;
broadcasting a predetermined uplink signal, wherein transmission power indicated by the transmission power information through an uplink resource, which is indicated by the dedicated uplink resource allocation information, is applied to the predetermined uplink signal;
receiving a second command message from the serving femto base station, the second command message including measurement results of the uplink signal measured by each of at least one femto base station included in the group; and
performing network re-entry to a target base station among the at least one femto base station.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to methods for performing fast handover by a terminal in an environment in which multiple femto base stations exist. A method for performing handover by a terminal includes transmitting, to a serving femto base station, a message for requesting seamless handover within a group including multiple femto base stations, the serving femto base station belonging to the group; receiving, from the serving femto base station, first command message including power information and allocation information; broadcasting an uplink signal that is applied with transmission power indicated by the power information, through an uplink resource indicated by the allocation information; receiving second command messages including measurements of the uplink signal measured by the multiple femto base stations from the serving femto base stations; and performing network re-entry to a target base station among the femto base stations.
-
Citations
15 Claims
-
1. A method for performing handover carried out by a terminal in a radio access system, wherein multiple femto base stations including a serving femto base station form a single group, the method comprising:
-
transmitting a request message for requesting a seamless handover within the formed group to the serving femto base station; receiving a first command message from the serving femto base station, the first command message including transmission power information and dedicated uplink resource allocation information being commonly applied to the formed group; broadcasting a predetermined uplink signal, wherein transmission power indicated by the transmission power information through an uplink resource, which is indicated by the dedicated uplink resource allocation information, is applied to the predetermined uplink signal; receiving a second command message from the serving femto base station, the second command message including measurement results of the uplink signal measured by each of at least one femto base station included in the group; and performing network re-entry to a target base station among the at least one femto base station. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method for supporting handover of a terminal carried out by a serving femto base station which belongs to a group comprising multiple femto base stations in a radio access system, the method comprising:
-
receiving a request message for requesting a seamless handover within the formed group from the terminal; negotiating at least one of a transmission power, at which a predetermined uplink signal that is to be broadcasted by the terminal, and a dedicated uplink resource for the terminal, with at least one femto base station belonging to the group; transmitting a first command message to the terminal, the first command message including at least one of transmission power information and dedicated uplink resource allocation information based upon the negotiation; receiving a measurement result from each of the at least one femto base station, each femto base station having measured the uplink signal; and transmitting a second command message to the terminal, the second command message including at least one measurement result. - View Dependent Claims (7, 8, 9, 10)
-
-
11. A mobile terminal operating in a radio access system, wherein multiple femto base stations including a serving femto base station form a single group, the mobile terminal comprising:
-
a processor; and a wireless communication module (or RF module) configured to transceives radio signals externally in accordance with a control of the processor, wherein the processor is configured to control a request message for requesting a seamless handover within the formed group to be transmitted to the serving femto base station, obtain transmission power information and dedicated uplink resource allocation information being commonly applied to the formed group through a first command message received from the serving femto base station, control a predetermined uplink signal applying transmission power indicated by the transmission power information to be broadcast through an uplink resource indicated by the dedicated uplink resource allocation information, control a second command message to be received from the serving femto base station, the second command message including measurement results of the uplink signal measured by each of at least one femto base station included in the group, and decide a target base station for performing network re-entry among the at least one femto base stations. - View Dependent Claims (12, 13, 14, 15)
-
Specification