Methods of operating wireless terminals and network nodes using high speed vehicle network indicators and related wireless terminals and network nodes
地域：
Stockholm
摘要
Methods of operating a wireless terminal may be provided. A high-speed indication may be received for a cell of a network node indicating that the cell is adapted to operate in a high-speed environment, and operation of the wireless terminal may be adapted to communicate through the cell of the network node in the high-speed environment responsive to receiving the high-speed indication. Methods of operating a node of a wireless communication network may also be provided. Communication service may be provided through a cell to a plurality of wireless terminals in a high-speed environment, and a high-speed indication may be transmitted through the cell to one of the plurality of wireless terminals, with the high-speed indication indicating that the cell is adapted to operate in a high-speed environment.
說(shuō)明書(shū)
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This application is a 35 U.S.C. § 371 national stage application of PCT International Application No. PCT/SE2016/050029, filed on Jan. 19, 2016, which itself claims the benefit of U.S. provisional Patent Application No. 62/109,821, filed Jan. 30, 2015,the disclosure and content of both of which are incorporated by reference herein in their entireties.
The present disclosure relates to the field of communications, and more particularly, to wireless communications and related methods, wireless terminals, and base stations.
In RAN#66, a study item (RP-142307) was agreed with targets to study possible enhancements to RRM (Radio Resource Management) performance in high speed train environments. The justification is that there are railways such as Japan Tohoku Shinkansen (320 km/h), German ICE (330 km/h), AGV Italo (400 km/h), and Shanghai Maglev (430 km/h) in which vehicles travel at speeds greater than 300 km/h and where there is demand for using mobile services. The high speed scenario may further include mission critical (MC) operations involving high speed vehicles in the air. An example of an MC operation is Air Ground Air communications (also known as A2G communications) where high speed vehicles may include helicopters and planes containing wireless terminals. The A2G vehicles may be served by high speed radio nodes (also known as A2G base stations, A2G eNode Bs, etc.). Speeds of helicopters and planes may be in the order of 200-300 km/hr and 400-500 km/hr respectively.
權(quán)利要求
The invention claimed is:1. A method of operating a wireless terminal, the method comprising:transmitting high-speed capability information to a first network node through a first cell of the first network node, the high-speed capability information indicating the wireless terminal is capable to communicate in a high speed operation mode; responsive to transmitting the high-speed capability information, receiving a high-speed indication for the first cell of the first network node indicating that the first cell is adapted to operate in a high-speed environment; adapting operation of the wireless terminal to communicate in the high speed operation mode through the first cell of the first network node in the high-speed environment responsive to receiving the high-speed indication, wherein adapting operation to communicate in the high speed operation mode in the high-speed environment comprises using first Radio Link Monitoring (RLM) thresholds to communicate with the first network node in the high-speed environment; and adapting operation of the wireless terminal to communicate through a second cell of a second network node in a normal-speed environment, wherein adapting operation to communicate in the normal-speed environment comprises using second Radio Link Monitoring (RLM) thresholds to communicate with the second network node in the normal-speed environment, and wherein the first and second RLM thresholds are different. 2. The method of claim 1 further comprising:receiving a normal-speed indication for the second cell indicating that the second cell is adapted to operate in the normal-speed environment; wherein adapting operation of the wireless terminal to communicate through the second cell comprises adapting operation of the wireless terminal to communicate through the second cell in the normal-speed environment responsive to receiving the normal-speed indication. 3. The method of claim 2 further comprising:receiving a medium-speed indication for a third cell of a third network node indicating that the third cell is adapted to operate in a medium-speed environment; and adapting operation of the wireless terminal to communicate through the third cell in the medium-speed environment responsive to receiving the medium-speed indication. 4. The method of claim 1 wherein adapting operation to communicate in the high speed operation mode in the high-speed environment comprises using a first layer 1 measurement period to communicate through the first cell in the high-speed environment, wherein adapting operation to communicate in the normal-speed environment comprises using a second layer 1 measurement period to communicate through the second cell in the normal-speed environment, and wherein the first and second layer 1 measurement periods are different. 5. The method of claim 4 wherein the first layer 1 measurement period is less than the second layer one measurement period. 6. The method of claim 5 wherein the first and second measurement periods are used to measure Reference Signal Received Power (RSRP) and/or Reference Signal Received Quality (RSRQ). 7. The method of claim 1 wherein adapting operation to communicate in the high speed operation mode in the high-speed environment comprises using a first measurement time to detect a new cell when communicating through the first cell in the high-speed environment, wherein adapting operation to communicate in the normal-speed environment comprises using a second measurement time to detect a new cell when communicating through the second cell in the normal-speed environment, and wherein the first measurement time is less than the second measurement time. 8. The method of claim 1 wherein adapting operation to communicate in the high speed operation mode in the high-speed environment comprises using a first evaluation time to evaluate whether a cell meets a reselection criteria and using a plurality of the first measurement times to detect the cell, wherein adapting operation to communicate in the normal-speed environment comprises using a second evaluation time to evaluate whether a cell meets a reselection criteria and using a plurality of the second measurement times to detect the cell, and wherein the first evaluation time is less than the second evaluation time. 9. The method of claim 1 wherein the first RLM thresholds include a first in-sync threshold and a first out-of-sync threshold, wherein the second RLM thresholds include a second in-sync threshold and a second out-of-sync threshold, wherein the second in-sync threshold is less than the first in-sync threshold, and wherein the second out-of-sync threshold is less than the first out-of-sync threshold. 10. The method of claim 1 wherein adapting operation to communicate in the high speed operation mode in the high-speed environment comprises using a first filter time constant for radio channel estimation when communicating through the first cell in the high-speed environment, wherein adapting operation to communicate in the normal-speed environment comprises using a second filter time constant for radio channel estimation when communicating through the second cell in the normal-speed environment, and wherein the second filter time constant is greater than the first filter time constant. 11. A wireless terminal comprising:a transceiver configured to provide radio communications with a wireless communication network over a radio interface; and a processor coupled with the transceiver, wherein the processor is configured to: transmit high-speed capability information to a first network node of the wireless communication network through a first cell of the first network node, the high-speed capability information indicating the wireless terminal is capable to communicate in a high speed operation mode; receive a high-speed indication for the first cell of the first network node responsive to transmitting the high-speed capability information, wherein the high-speed indication indicates that the first cell is adapted to operate in a high-speed environment, and wherein the high-speed indication is received through the transceiver; adapt operation of the wireless terminal to communicate in the high speed operation mode through the transceiver and the first cell in the high-speed environment responsive to receiving the high-speed indication, wherein adapting operation to communicate in the high speed operation mode in the high-speed environment comprises using first Radio Link Monitoring (RLM) thresholds to communicate with the first network node in the high-speed environment; and adapt operation of the wireless terminal to communicate through a second cell of a second network node in a normal-speed environment, wherein adapting operation to communicate in the normal-speed environment comprises using second Radio Link Monitoring (RLM) thresholds to communicate with the second network node in the normal-speed environment, and wherein the first and second RLM thresholds are different. 12. The wireless terminal of claim 11 wherein the processor is further configured to,receive a normal-speed indication for the second cell indicating that the second cell is adapted to operate in the normal-speed environment, wherein adapting operation of the wireless terminal to communicate through the second cell comprises adapting operation of the wireless terminal to communicate through the second cell in the normal-speed environment responsive to receiving the normal-speed indication. 13. The wireless terminal of claim 12 wherein the processor is further configured to,receive a medium-speed indication for a third cell of a third network node indicating that the third cell is adapted to operate in a medium-speed environment; and adapt operation of the wireless terminal to communicate through the third cell in the medium-speed environment responsive to receiving the medium-speed indication. 14. The wireless terminal of claim 11 wherein adapting operation to communicate in the high speed operation mode in the high-speed environment comprises using a first layer 1 measurement period to communicate through the first cell in the high-speed environment, wherein adapting operation to communicate in the normal-speed environment comprises using a second layer 1 measurement period to communicate through the second cell in the normal-speed environment, and wherein the first and second layer 1 measurement periods are different. 15. The wireless terminal of claim 14 wherein the first layer 1 measurement period is less than the second layer one measurement period. 16. The wireless terminal of claim 15 wherein the first and second measurement periods are used to measure Reference Signal Received Power (RSRP) and/or Reference Signal Received Quality (RSRQ). 17. The wireless terminal of claim 11 wherein adapting operation to communicate in the high speed operation mode in the high-speed environment comprises using a first measurement time to detect a new cell when communicating through the first cell in the high-speed environment, wherein adapting operation to communicate in the normal-speed environment comprises using a second measurement time to detect a new cell when communicating through the second cell in the normal-speed environment, and wherein the first measurement time is less than the second measurement time. 18. The wireless terminal of claim 11 wherein adapting operation to communicate in the high speed operation mode in the high-speed environment comprises using a first evaluation time to evaluate whether a cell meets a reselection criteria and using a plurality of the first measurement times to detect the cell, wherein adapting operation to communicate in the normal-speed environment comprises using a second evaluation time to evaluate whether a cell meets a reselection criteria and using a plurality of the second measurement times to detect the cell, and wherein the first evaluation time is less than the second evaluation time. 19. The wireless terminal of claim 11 wherein the first RLM thresholds include a first in-sync threshold and a first out-of-sync threshold, wherein the second RLM thresholds include a second in-sync threshold and a second out-of-sync threshold, wherein the second in-sync threshold is less than the first in-sync threshold, and wherein the second out-of-sync threshold is less than the first out-of-sync threshold. 20. The wireless terminal of claim 11 wherein adapting operation to communicate in the high speed operation mode in the high-speed environment comprises using a first filter time constant for radio channel estimation when communicating through the first cell in the high-speed environment, wherein adapting operation to communicate in the normal-speed environment comprises using a second filter time constant for radio channel estimation when communicating through the second cell in the normal-speed environment, and wherein the second filter time constant is greater than the first filter time constant.
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