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Dan,
Could you please clarify the term "existing infrastructure" in the requirement of "The 802.20 system shall be designed to provide ubiquitous broadband wireless access in a cellular architecture and be capable of reusing existing infrastructure"? Is there any common "existing infrastructure" to every operator?
Thanks,
Junyi Li
-----Original Message-----
The following are comments and text change proposals for incorporation in the next revision of IEEE 802.20 SRD (System Requirements Document) rev 8b:
Regards, Dan Gal
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Section 3.1 : System Architecture Current text: "The 802.20 system must be designed to provide ubiquitous broadband wireless access in a cellular architecture." New text: "The 802.20 system shall be designed to provide ubiquitous broadband wireless access in a cellular architecture and be capable of reusing existing infrastructure." Rationale: align with the requirements of the PAR (see "Cell Sizes" item in the table in section 1.3) ------------------- Section 4.1.12 - Antenna Diversity Proposal: delete the section. Rationale: Redundant requirement. Section 4.1.11 covers it all. ------------------ Section 4.1.2 - Spectral Efficiency Current text: " Editors Note: Michael Youssefmir to supply definition of expected aggregate throughput for Appendix B. Sustained spectral efficiency is computed in a loaded multi-cellular network setting. It is defined as the ratio of the expected aggregate throughput (taking out all PHY/MAC overhead) to all users in an interior cell divided by the system bandwidth. The sustained spectral efficiency calculation shall assume that users are distributed uniformly throughout the network and shall include a specification of the minimum expected data rate/user. [Downlink > 2 bps/Hz/sector] [Uplink >1 bps/Hz/sector]
1. New text: Sustained spectral efficiency is computed in a loaded multi-cellular, three-sector per cell, network setting. It is defined as the ratio of the expected aggregate throughput (taking out all PHY/MAC overhead) to all users in a cell divided by the total spectrum deployed in that cell. The sustained spectral efficiency calculation shall assume that users are distributed uniformly throughout the network and shall include a specification of the minimum expected data rate/user. Given the above definition, the minimum spectral efficiency requirements shall be: - Downlink: greater than 6 bps/Hz/cell - Uplink: greater than 3 bps/Hz/cell Rationale: The change reflects recent comments and requests to change the definition to bps/Hz/cell and the need to baseline all proposals on a three-sector cell configuration. Thus, the previous figures were factored by 3. 2. Comment on UL/DL symmetry: The PAR provides just one number (" >1b/s/Hz/cell") - why then aren't the UL and DL figures the same? ----------------------- Section 4.1.4 - Support for Different Block Assignments Add the following text at the end of section: "Proposals shall support all block assignments of a given frequency arrangement (FDD, TDD)" Rationale: add clarity to the current text.
------------------------------------------------------------------------------------------------------------------------------------------- Dan Gal
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