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Initial Access Channel for Scalable Wireless Mobile Communication Networks

a wireless mobile communication network and initial access technology, applied in the field of wireless mobile communication systems, can solve the problems of longer access time and complexity of the approach

Inactive Publication Date: 2009-11-05
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method for transmitting an access channel in a network with different types of user equipment (UE) capabilities and system bandwidths. The access channel is transmitted using a bandwidth that is less than the system bandwidth. The patent also describes a method for decoding a basic BCH and an Extended BCH from a diversity transmitted signal. Additionally, the patent describes a base transceiver station that selects a bandwidth for an access channel and transmits it. The technical effects of the patent include improved efficiency in transmitting data and improved decoding of signals.

Problems solved by technology

This approach requires longer access time and complexity.

Method used

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  • Initial Access Channel for Scalable Wireless Mobile Communication Networks
  • Initial Access Channel for Scalable Wireless Mobile Communication Networks
  • Initial Access Channel for Scalable Wireless Mobile Communication Networks

Examples

Experimental program
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first embodiment

[0088]FIG. 11A is a diagram of an example frame 302 for transmission used in accordance with one embodiment of the invention. More particularly, FIG. 11A illustrates a first embodiment where there are two types of SCH, a PSC and an SSC, in a system bandwidth greater than or equal to 5 MHz. FIG. 11A is only one example of a frame structure that can be used in accordance with this embodiment of the invention.

[0089]Shown is frame 302 which in this example of 10 ms duration. Not shown is frame N−1 which precedes frame 302 and Frame N+1 which follows frame 302. Frame 302 is comprised of a plurality of Transmission Time Intervals (TTI) TTI-1304, TTI-2306, TTI-3308, TTI-4310, TTI-19312 and TTI-20314. For the sake of clarity, the TTIs between TTI-4310 and TTI-19312 are not shown. In this representative example, each TTI is of 0.5 ms duration, though 0.5 ms TTI is only an example. Therefore, in this example, there are a total of 20 TTIs in frame 302. Each TTI comprises seven OFDM symbols

[009...

second embodiment

[0096]FIG. 12A is a diagram of an example frame 402 used in accordance with one embodiment of the invention. More particularly, FIG. 12A illustrates a second embodiment, in a Type-2 system, i.e. a system bandwidth less than 5 MHz. FIG. 12A is only one example of a frame structure that can be used in accordance with this embodiment of the invention.

[0097]Shown is frame 402 which in this example of 10 ms duration. Not shown is frame N−1 which precedes frame 402 and Frame N+1 which follows frame 402. Frame 402 is comprised of TTI-1404, TTI-2406, TTI-3408, TTI-4410, TTI-19412 and TTI-20414. For the sake of clarity, the TTIs between TTI-4410 and TTTi-19412 are not shown. In this representative example, each TTI is of 0.5 ms duration. Therefore, in this example, there are a total of 20 TTIs frame 402.

[0098]In this embodiment, SSC 416 is transmitted in a slot located at the beginning of each TTI in frame 402. BCH 422 is transmitted in a slot located at the end of TTI-20414. A first PSC 420...

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Abstract

Physical layer structures and access schemes for use in such networks are described and in particular initial access channel (IACH) structures are proposed. A spectrum efficient downlink (DL) IACH design supports different types of User Equipment (UE) capabilities and different system bandwidths. An IACH includes the synchronization channel (SCH) and broadcast-control channel (BCH). A non-uniform SCH for all system bandwidths is provided, as well as scalable bandwidth BCH depending on system bandwidth. An initial access procedure is provided, as well as an access procedure.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Patent Application No. 60 / 759,388 filed Jan. 17, 2006, U.S. Provisional Patent Application No. 60 / 722,744 filed Sep. 30, 2005, and U.S. Provisional Patent Application No. 60 / 814,417 filed Jun. 16, 2006, which are each hereby incorporated by reference in their entirety.FIELD OF THE INVENTION[0002]The invention relates to wireless mobile communication systems, and in particular to physical layer structures and access schemes for use in such networks.BACKGROUND[0003]In OFDM (Orthogonal Frequency Division Multiplexing) and OFDMA (Orthogonal Frequency Division Multiple Access) wireless communication networks, data streams are typically transmitted in parallel using multiple orthogonal sub-carriers or tones within a single channel. The use of orthogonal sub-carriers allows the sub-carriers, spectra to overlap, thus achieving high spectrum efficiency. An OFDM system maps coded or modulated ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04W72/12H04B7/00H04J11/00H04W74/08
CPCH04L1/06H04L1/0618H04L5/023H04W74/0866H04L27/2662H04W74/006H04L27/2657H04L27/2627H04W74/0891
Inventor MA, JIANGLEIXU, HUAJIA, MINGBOUMENDIL, SARAHLE STRAT, EVELYNEZHANG, HANGZHU, PEIYINGTONG, WEN
Owner APPLE INC
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