Method for compulsorily performing handover in broadband wireless communication system
First Claim
1. A method for performing a handover by a mobile station in a communication system, the method comprising:
- transmitting a handover request message to a serving base station when it is detected that a handover is necessary;
receiving a first handover response message, from the serving base station, including a list of at least one neighbor base station capable of providing a service to the mobile station in response to the handover request message;
transmitting a handover indication message including handover rejection information to the serving base station when the mobile station determines to reject the handover after receiving the first handover response message; and
receiving a second handover response message, from the serving base station, including a new list of at least one neighbor base station capable of providing the service to the mobile station after transmitting the handover indication message,wherein the handover rejection information indicates the mobile station intends to reject performing the handover with any neighbor base station in the list in the first handover response message, and to receive the new list that is different from the list in the first handover response message;
wherein a predetermined handover indicator type field in the handover indication message includes the handover rejection information represented by two bits, which is chosen from among at least three values for the handover indicator type field, each of the three values indicating either a connection release with the serving base station, a handover cancel or the handover rejection information; and
wherein the value representing the connection release with the serving base station indicates that the mobile station intends to release a link currently setup with the serving base station, and the value representing the handover cancel indicates that the mobile station intends to cancel the handover and resume communication with the serving base station.
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Accused Products
Abstract
Disclosed is a method for enabling a mobile station existing in a serving cell area to perform a handover procedure in a broadband mobile communication system including the mobile station, a serving base station providing a service to the mobile station, and one or more target base stations containing at least one target cell area overlapping with the serving cell area occupied by the serving base station. The method includes transmitting a handover request message from the mobile station to the serving base station when it is detected that a performance of a handover is necessary; and transmitting a handover indication message containing handover cancel information to the serving base station when the mobile station determines a cancel of the handover while the mobile station is being handed over to one or more target base stations by the serving base station.
26 Citations
16 Claims
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1. A method for performing a handover by a mobile station in a communication system, the method comprising:
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transmitting a handover request message to a serving base station when it is detected that a handover is necessary; receiving a first handover response message, from the serving base station, including a list of at least one neighbor base station capable of providing a service to the mobile station in response to the handover request message; transmitting a handover indication message including handover rejection information to the serving base station when the mobile station determines to reject the handover after receiving the first handover response message; and receiving a second handover response message, from the serving base station, including a new list of at least one neighbor base station capable of providing the service to the mobile station after transmitting the handover indication message, wherein the handover rejection information indicates the mobile station intends to reject performing the handover with any neighbor base station in the list in the first handover response message, and to receive the new list that is different from the list in the first handover response message; wherein a predetermined handover indicator type field in the handover indication message includes the handover rejection information represented by two bits, which is chosen from among at least three values for the handover indicator type field, each of the three values indicating either a connection release with the serving base station, a handover cancel or the handover rejection information; and wherein the value representing the connection release with the serving base station indicates that the mobile station intends to release a link currently setup with the serving base station, and the value representing the handover cancel indicates that the mobile station intends to cancel the handover and resume communication with the serving base station. - View Dependent Claims (2, 3, 4, 5)
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6. A method for performing a handover by a serving base station in a communication system, the method comprising:
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receiving, from a mobile station, a handover request message; transmitting, to the mobile station, a first handover response message including a list of at least one neighbor base station capable of providing a service to the mobile station in response to the handover request message; receiving, from the mobile station, a handover indication message including handover rejection information; and transmitting, to the mobile station, a second handover response message including a new list of at least one neighbor base station capable of providing the service to the mobile station after receiving the handover indication message; wherein the handover rejection information indicates the mobile station intends to reject performing the handover with any neighbor base station in the list in the first handover response message, and to receive the new list that is different from the list in the first handover response message; wherein a predetermined handover indicator type field in the handover indication message includes the handover rejection information represented by two bits, which is chosen from among at least three values for the handover indicator type field, each of the three values indicating either a connection release with the serving base station, a handover cancel or the handover rejection information; and wherein the value representing the connection release with the serving base station indicates that the mobile station intends to release a link currently setup with the serving base station, and the value representing the handover cancel indicates that the mobile station intends to cancel the handover and resume communication with the serving base station. - View Dependent Claims (7, 8)
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9. A system for performing a handover in a communication system, comprising:
- a mobile station for transmitting a handover request message to a serving base station when it is detected that a handover is necessary, receiving a first handover response message, from the serving base station, including a list of at least one neighbor base station capable of providing a service to the mobile station in response to the handover request message, transmitting a handover indication message including handover rejection information to the serving base station when the mobile station determines to reject the handover after receiving the first handover response message, and receiving a second handover response message, from the serving base station, including a new list of at least one neighbor base station capable of providing the service to the mobile station after transmitting the handover indication message, wherein the handover rejection information indicates the mobile station intends to reject performing the handover with any neighbor base station in the list in the first handover response message, and to receive the new list that is different from the list in the first handover response message;
wherein a predetermined handover indicator type field in the handover indication message includes the handover rejection information represented by two bits, which is chosen from among at least three values for the handover indicator type field, each of the three values indicating, either a connection release with the serving base station, a handover cancel or the handover rejection information; and
wherein the value representing the connection release with the serving base station indicates that the mobile station intends to release a link currently setup with the serving base station, and the value representing the handover cancel indicates that the mobile station intends to cancel the handover and resume communication with the serving base station. - View Dependent Claims (10, 11, 12, 13)
- a mobile station for transmitting a handover request message to a serving base station when it is detected that a handover is necessary, receiving a first handover response message, from the serving base station, including a list of at least one neighbor base station capable of providing a service to the mobile station in response to the handover request message, transmitting a handover indication message including handover rejection information to the serving base station when the mobile station determines to reject the handover after receiving the first handover response message, and receiving a second handover response message, from the serving base station, including a new list of at least one neighbor base station capable of providing the service to the mobile station after transmitting the handover indication message, wherein the handover rejection information indicates the mobile station intends to reject performing the handover with any neighbor base station in the list in the first handover response message, and to receive the new list that is different from the list in the first handover response message;
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14. A system for performing a handover in a communication system, comprising:
- a serving base station for receiving, from a mobile station, a handover request message, transmitting, to the mobile station, a first handover response message including a list of at least one neighbor base station capable of providing a service to the mobile station in response to the handover request message, receiving, from the mobile station, a handover indication message including handover rejection information, and transmitting, to the mobile station, a second handover response message including a new list of at least one neighbor base station capable of providing the service to the mobile station after receiving the handover indication message, wherein the handover rejection information indicates the mobile station intends to reject performing the handover with any neighbor base station in the list in the first handover response message, and to receive the new list that is different from the list in the first handover response message;
wherein a predetermined handover indicator type field in the handover indication message includes the handover rejection information represented by two bits, which is chosen from among, at least three values for the handover indicator type field, each of the three values indicating either a connection release with the serving base station, a handover cancel or the handover rejection information; and
wherein the value representing;
the connection release with the serving base station indicates that the mobile station intends to release a link currently setup with the serving base station, and the value representing the handover cancel indicates that the mobile station intends to cancel the handover and resume communication with the serving base station. - View Dependent Claims (15, 16)
- a serving base station for receiving, from a mobile station, a handover request message, transmitting, to the mobile station, a first handover response message including a list of at least one neighbor base station capable of providing a service to the mobile station in response to the handover request message, receiving, from the mobile station, a handover indication message including handover rejection information, and transmitting, to the mobile station, a second handover response message including a new list of at least one neighbor base station capable of providing the service to the mobile station after receiving the handover indication message, wherein the handover rejection information indicates the mobile station intends to reject performing the handover with any neighbor base station in the list in the first handover response message, and to receive the new list that is different from the list in the first handover response message;
Specification