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PROVIDING ADDITIONAL PAGING AND ACCESS CHANNELS FOR THE JAPANESE CELLULAR MOBILE TELEPHONE SYSTEM

IP.com Disclosure Number: IPCOM000005639D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2001-Oct-23
Document File: 2 page(s) / 100K

Publishing Venue

Motorola

Related People

Kenneth A. Felix: AUTHOR

Abstract

As currently envisioned, the Japanese cellular mobile telephone system ('JTACS") will require up to 180 channels per cell. This is far above the current 120 voice channels capacity of cellular base sites commercially available from Motorola. In addition, the signaling rate of the paging and access channels is being reduced from 10,000 bits per second to 4000 bits per second to accommodate the narrower bandwidth of the JTACS RF channels. As a consequence, it would be helpful if the JTACS system had additional procedures for assign- ing and acquiring paging and access channels thereby providing more flexibility than either the U.S. or U.K. cellular systems currently have. This would alleviate the access limitation of the JTACS signaling channels due to the reduced bit rates.

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MOTOROLA Technical Developments October 1987

PROVIDING ADDITIONAL PAGING AND ACCESS CHANNELS FOR THE JAPANESE CELLULAR MOBILE TELEPHONE SYSTEM

by Kenneth A. Felix

STATEMENT OF PROBLEM

   As currently envisioned, the Japanese cellular mobile telephone system ('JTACS") will require up to 180 channels per cell. This is far above the current 120 voice channels capacity of cellular base sites commercially available from Motorola. In addition, the signaling rate of the paging and access channels is being reduced from 10,000 bits per second to 4000 bits per second to accommodate the narrower bandwidth of the JTACS RF channels. As a consequence, it would be helpful if the JTACS system had additional procedures for assign- ing and acquiring paging and access channels thereby providing more flexibility than either the U.S. or U.K. cellular systems currently have. This would alleviate the access limitation of the JTACS signaling channels due to the reduced bit rates.

SOLUTION

    One possible solution is that when additional paging and access channels are required, an additional word (or two) be added to the overhead signaling stream on the primary access channel. This could be in the form of a new ACT word assignment or it could be one of the current ACT local control word assignments (see Elec- tronics Industries Association Interim Standard IS-3). It's function would be similar to the directed retry message currently used in the U.S. and U.K. cellular systems. The difference would be that the overhead word which assigns the paging and access channel would concern all mobiles, not just one mobile as the directed retry message does.

The operation would proceed as follows.

Mobiles scan the original 21 signaling channels as they presently do. If subscriber density is such that only one paging and access channel is required, the operation proceeds as currently performed in U.S. and
U.K. cellular systems.

   If more paging and access channels are required, however, the procedure is modified. In this case, a local control word (one or more) would be attached to the overhead message stream, and this word would assign additional paging the access channels in the same manner that the directed retry message assigns different access channels. The mobiles, upon receiving this overhead word on their initialization scan, would look at the least significant bit (or bits) of the mo...