Method for obtaining a timing advance value
View Patent ↗Timing control procedure is needed for uplink transmissions in several communication networks. Some networks and bands have physical and regulatory limitations for obtaining timing advance value in conventional manner. One example of these limitations is disabled downlink channel in TV white spaces. The present invention provides an arrangement for obtaining timing advance value in a situation wherein the use of downlink channel is disabled.
1. A method comprising:
receiving uplink data at a user equipment for uplink data transmission;
receiving a location of a base station from a database in response to requesting the location of the base station from the database;
calculating a timing advance value based on a location of the user equipment and the location of the base station;
transmitting, from the user equipment, the uplink data using the timing advance value calculated and simultaneously starting a timing advance resolution timer;
determining whether a timing advance command is received at the user equipment in response to the transmission of uplink data before the timing advance resolution timer expires;
adjusting the timing advance value at the user equipment when the timing advance command is received while the timing advance resolution timer continues to run; and
requesting a timing advance value of a neighboring user equipment from the neighboring user equipment when the timing advance resolution timer expires before the timing advance command is received.
2. The method according to claim 1 , further comprising determining whether the user equipment receives a scheduling signal from the base station.
3. The method according to claim 2 , further comprising:
initializing an inquiry timer at the user equipment when the timing advance value of the neighboring user equipment is requested.
4. The method according to claim 3 , wherein the method further comprises:
receiving a timing advance value and location from at least one neighboring user equipment;
calculating a distance between the user equipment and each neighboring user equipment; and
choosing the timing advance value as one of:
a timing advance value of a closest neighboring user equipment;
an average of timing advance values received from neighboring user equipments; or
a timing advance value selected at random from among received timing advance values.
5. An apparatus comprising:
circuitry configured to
request and receive a location of a base station from a database;
calculate a timing advance value based on a location of the apparatus and a location of the base station;
transmit uplink data using the timing advance value calculated and simultaneously start a timing advance resolution timer;
determine whether a timing advance command is received in response to the transmission of uplink data before the timing advance resolution timer expires;
adjust the timing advance value when the timing advance command is received while the timing advance resolution timer continues to run; and
request a timing advance value of a neighboring user equipment from the neighboring user equipment when the timing advance resolution timer expires before the timing advance command is received.
6. The apparatus according to claim 5 , wherein the circuitry is further configured to receive a scheduling signal from the base station.
7. The apparatus according to claim 6 , wherein the circuitry is further configured to:
initialize an inquiry timer when the timing advance value of the neighboring user equipment is requested.
8. The apparatus according to claim 7 , wherein the circuitry is further configured to:
receive a timing advance value and location from at least one neighboring user equipment;
calculate a distance between the user equipment and each of neighboring user equipment respectively; and
choose a timing advance value as one of
a timing advance value of a closest neighboring user equipment;
an average of timing advance values of neighboring user equipments; or
a timing advance value selected at random from received timing advance values.
9. The apparatus according to claim 7 , wherein the circuitry is further configured to perform random access channel transmission for obtaining a timing advance value when a timing advance value is not received from a neighboring user equipment.
10. The apparatus according to claim 5 , wherein the apparatus is an LTE-device.
11. The apparatus according to claim 5 , wherein the apparatus is a chipset.
12. The apparatus according to claim 5 , wherein the apparatus operates on TV white spaces.
13. The apparatus according to claim 5 , wherein the database is a TV white space database.
14. The apparatus according to claim 5 , wherein the circuitry is further configured to request a timing advance value from a base station as a response to a location change.
15. The apparatus according to claim 5 , wherein the circuitry is further configured to send the timing advance value to a neighboring user equipment as a response to a request from the base station.
16. A non-transitory computer-readable medium encoded with computer-readable instructions that, when executed by processing circuitry, cause the processing circuitry to perform a method comprising:
receiving uplink data at a user equipment for uplink data transmission;
calculating a timing advance value based on a location of the user equipment and a location of the base station received from a database;
transmitting, from the user equipment, the uplink data using the timing advance value calculated and simultaneously starting a timing advance resolution timer;
determining whether a timing advance command is received in response to the transmission of uplink data at the user equipment before the timing advance resolution timer expires;
adjusting the timing advance value at the user equipment when the timing advance command is received while the timing advance resolution timer continues to run; and
requesting a timing advance value of a neighboring user equipment from the neighboring user equipment when the timing advance resolution timer expires before the timing advance command is received.