Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W74/00—Wireless channel access
  • H04W74/08—Non-scheduled access, e.g. ALOHA
  • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
  • H04W74/0891—Non-scheduled access, e.g. ALOHA using a dedicated channel for access for synchronized access
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
  • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events

Definitions

• a wireless multiple-access communications system may include a number of base stations, each simultaneously supporting communication for multiple mobile terminals.
• Base stations may communicate with mobile terminals on downstream and upstream links.
• Each base station has a coverage range, which may be referred to as the coverage area of the cell.
• Mobile stations desiring to enter the coverage area of a base station may initiate contact to establish communications with the base station. For example, when a mobile station desires to enter the coverage area of a base station, the mobile station may send an initial transmission to the base station. If the mobile station does not receive a response, the mobile station may increase the transmission power and retransmit the initial transmission. When the base station receives the initial transmission, it may communicate a response to the mobile station with transmission-related information that enables the mobile station and the base station to establish a communications channel.
• the mobile station may periodically transmit requests to the base station requesting updated transmission-related information. These periodic requests use battery resources of the mobile station and the receipt of such requests, and generation of responses to the requests, use bandwidth. As a result, transmitting periodic requests when it is unnecessary may waste resources, such as battery power and bandwidth, in devices in current wireless network systems.
• a change in a signal quality metric of the mobile device may be identified. For example, a value of the signal quality metric at the time the previous ranging procedure was executed may be compared with a current value of the signal quality metric. Upon determining that that change in signal quality metric does not exceed a threshold value, the next scheduled ranging procedure may be bypassed. The ranging procedure may be performed based on a determination that the change in the signal quality metric exceeds the threshold value.
• the signal quality metric may include a carrier-to-noise ratio (CNR) or a signal-to-noise ratio (SNR).
• an interval between ranging procedures may be modified based on the determination that the change in location is less than the threshold distance.
• the interval between ranging procedures may be extended based on the determination that the change in location is less than the threshold distance.
• an interval between ranging procedures may be modified based on the determination that the change in the signal quality metric exceeds the threshold value.
• the interval between ranging procedures may be decreased when the change in the signal quality metric exceeds the threshold value.
• the interval between ranging procedures may be extended when the signal quality metric is less than the threshold value.
• a ranging procedure may be performed based on the determination that the change in location exceeds the threshold distance.
• the ranging procedure may include transmitting a ranging procedure request message.
• a ranging procedure response message may be received.
• At least one metric of the device may be adjusted based on the received ranging procedure response message. Examples of the at least one metric to be adjusted may include timing of a signal to be transmitted, transmission power used to transmit a signal, or a frequency offset of a signal to be transmitted by the device.
• the apparatus may include a receiver to receive a ranging procedure request from the mobile device.
• the ranging procedure request may be transmitted based on a determination that a change in location of the mobile device exceeds a threshold distance.
• the apparatus may also include a ranging calculation module,
• FIG. 4A shows a block diagram of a further example of the location module
• FIG. 10 is a flow chart of a method to use signal quality metric based information to determine whether to modify a ranging procedure by the mobile device;
• FIG. 1 1 is a flow chart of a method to use location-based information and state information of the mobile device to determine whether to perform ranging procedures;
• Ranging procedures may be carried out to maintain the quality of an existing connection between a mobile device and a base station. These procedures may be scheduled to occur at regular intervals.
• the described methods, systems, and computer-program products use location-based information and signal quality metric information of the mobile device to determine whether to execute a ranging procedure at the scheduled time. The decision may be based on the change of location of the mobile device. For example, a change in location of the mobile device since the previous ranging procedure may be identified. The identified change in location may be analyzed to determine whether the change exceeds a threshold distance.
• the generation module 320 may include a bypass instruction generation module 450, a modification generation module 455, and an execute instruction generation module 460.
• the generation module 320 may generate instructions based on the determination of the various components of the location module 315-a. For example, the location delta module 440 may determine that the change in location of the mobile device 1 10-a is less than a threshold distance.
• the signal quality metric delta module 445 may determine that the change in the value of the signal quality metric does not exceed a threshold value.
• the bypass instruction generation module 450 may generate a bypass instruction that indicates that the next scheduled periodic ranging procedure is to be bypassed or skipped.
• FIG. 6 is a flow chart illustrating one configuration of a method 600 to use location-based information to determine whether to execute a ranging procedure.
• the method 600 is described below with reference to the device 110-a shown in FIG. 2, which is an example of the mobile device 110 shown in FIG 1.
• the processor 280 in connection with the location module 286, may execute one or more sets of codes to control the functional elements of the device 1 10-a to perform the functions described below.
• the method 600 may provide for using location-based information to determine whether to execute a ranging procedure. It should be noted that the method 600 is just one implementation and that the operations of the method 600 may be rearranged or otherwise modified such that other implementations are possible.
• a ranging procedure may be performed while the mobile device 1 10-a is at a first location.
• a ranging procedure request may be transmitted from the mobile device 110-a to a base station 105-a, such as the base station 105-a from FIG. 5, which is an example of the base station 105-a of FIG. 2, which is an example of the base station 105-a of FIG. 1.
• the base station 105-a may receive the request and calculate ranging measurements that may include changes to the timing offsets, transmission power levels, etc. of the mobile device 105-a.
• the base station 105-a may transmit a ranging procedure response to the mobile station 110-a that includes the ranging measurements.
• the change in location of the device 110-a from the first location where the previous ranging procedure was performed to the current location may be identified.
• the mobile device may determine the change in location by comparing the current location of the device 1 10-a with the location previously stored (i.e., the location at which the mobile device performed the most recent ranging procedure).
• a determination may be made as to whether the change in location exceeds a threshold distance. If it is determined that the change in location does exceed the threshold distance, the method 900 may return to block 905 to perform the next scheduled ranging procedure, and the timer T4 may be restarted. If, however, it is determined that the change in location does not exceed the threshold distance, at block 920, a change in a signal quality metric of the device 110-a from the location associated with the previous ranging procedure to the current location may be identified 920. The change may be determined by comparing the current value of the signal quality metric with the stored value of the metric that was stored when the previous ranging procedure was performed.
• the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)

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• 2011
  • 2011-09-21 US US13/238,566 patent/US8872701B2/en not_active Expired - Fee Related
• 2012
  • 2012-09-06 CN CN201280045876.7A patent/CN103814619B/zh not_active Expired - Fee Related
  • 2012-09-06 KR KR1020147010611A patent/KR101495669B1/ko not_active Expired - Fee Related
  • 2012-09-06 EP EP12759605.4A patent/EP2759179B1/en not_active Not-in-force
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