Uplink synchronization method and apparatus
First Claim
1. An uplink synchronization method comprising:
- obtaining a first timing advance of a first carrier according to a random access channel (RACH) or a reference symbol (RS) in the first carrier;
obtaining a second timing advance of a second carrier according to the first timing advance wherein an initial RACH access process does not need to be performed at the second carrier;
sending data in the second carrier at an uplink sending time corresponding to the second timing advance;
wherein the second timing advance of the second carrier is equal to the first timing advance of the first carrier;
orwherein the second timing advance of the second carrier is a sum of the first timing advance of the first carrier and the difference between downlink delays of the first and second carriers.
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Accused Products
Abstract
Embodiments of the present invention relates to an uplink synchronization method and apparatus, where the method includes: obtaining a timing advance of a second frequency point according to a timing advance of a first frequency point; and sending data at an uplink sending time corresponding to the timing advance of the second frequency point. According to embodiments of the present invention, the TA of the second frequency point can be obtained according to the TA of the first frequency point, and a RACH access process does not need to be performed at the second frequency point, which effectively reduces the network resources occupied by the RACH process, and shortens the produced delay, thereby improving the performance of the entire system.
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Citations
7 Claims
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1. An uplink synchronization method comprising:
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obtaining a first timing advance of a first carrier according to a random access channel (RACH) or a reference symbol (RS) in the first carrier; obtaining a second timing advance of a second carrier according to the first timing advance wherein an initial RACH access process does not need to be performed at the second carrier; sending data in the second carrier at an uplink sending time corresponding to the second timing advance; wherein the second timing advance of the second carrier is equal to the first timing advance of the first carrier;
orwherein the second timing advance of the second carrier is a sum of the first timing advance of the first carrier and the difference between downlink delays of the first and second carriers. - View Dependent Claims (2, 3)
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4. An uplink synchronization apparatus comprising:
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a transmitter, configured to send a random access channel (RACH) preamble in a first carrier by user equipment during a RACH access process; processor configured to; obtain a first timing advance of the first carrier according to a random access channel (RACH) or a reference symbol (RS) in the first carrier; obtain a second timing advance of a second carrier according to the first timing advance wherein an initial RACH access process does not need to be performed at the second carrier; a transmitter, configured to send data in the second carrier at an uplink sending time corresponding to the second timing advance; wherein the second timing advance of the second carrier is equal to the first timing advance of the first carrier;
orwherein the second timing advance of the second carrier is a sum of the first timing advance of the first carrier and the difference between downlink delays of the first and second carriers. - View Dependent Claims (5, 6)
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7. A non-transitory computer-readable media comprising computer executable instructions, wherein the computer executable instructions, when executed by a processor, perform the steps of:
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obtaining a first timing advance of a first carrier according to a random access channel (RACH) or a reference symbol (RS) in the first carrier; obtaining a second timing advance of a second carrier according to the first timing advance wherein an initial RACH access process does not need to be performed at the second carrier; sending data in the second carrier at an uplink sending time corresponding to the second timing advance; wherein the second timing advance of the second carrier is equal to the first timing advance of the first carrier;
orwherein the second timing advance of the second carrier is a sum of the first timing advance of the first carrier and the difference between down link delays of the first and second carriers.
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Specification